diff --git a/fhir-server/src/main/java/au/csiro/pathling/update/ImportExecutor.java b/fhir-server/src/main/java/au/csiro/pathling/update/ImportExecutor.java
index 7b9ffbbc44..37baf4142b 100644
--- a/fhir-server/src/main/java/au/csiro/pathling/update/ImportExecutor.java
+++ b/fhir-server/src/main/java/au/csiro/pathling/update/ImportExecutor.java
@@ -29,6 +29,7 @@
 import au.csiro.pathling.io.FileSystemPersistence;
 import au.csiro.pathling.io.ImportMode;
 import ca.uhn.fhir.rest.annotation.ResourceParam;
+import io.delta.tables.DeltaTable;
 import jakarta.annotation.Nonnull;
 import java.net.URLDecoder;
 import java.nio.charset.StandardCharsets;
@@ -39,6 +40,7 @@
 import org.apache.spark.api.java.function.FilterFunction;
 import org.apache.spark.api.java.function.MapFunction;
 import org.apache.spark.sql.Dataset;
+import org.apache.spark.sql.Row;
 import org.apache.spark.sql.SparkSession;
 import org.apache.spark.sql.catalyst.encoders.ExpressionEncoder;
 import org.hl7.fhir.instance.model.api.IBaseResource;
@@ -50,6 +52,7 @@
 import org.hl7.fhir.r4.model.OperationOutcome.OperationOutcomeIssueComponent;
 import org.hl7.fhir.r4.model.Parameters;
 import org.hl7.fhir.r4.model.Parameters.ParametersParameterComponent;
+import org.hl7.fhir.r4.model.StringType;
 import org.hl7.fhir.r4.model.UrlType;
 import org.springframework.context.annotation.Profile;
 import org.springframework.stereotype.Component;
@@ -110,7 +113,7 @@ public ImportExecutor(@Nonnull final SparkSession spark,
   public OperationOutcome execute(@Nonnull @ResourceParam final Parameters inParams) {
     // Parse and validate the JSON request.
     final List<ParametersParameterComponent> sourceParams = inParams.getParameter().stream()
-        .filter(param -> "source".equals(param.getName())).collect(Collectors.toList());
+        .filter(param -> "source".equals(param.getName())).toList();
     if (sourceParams.isEmpty()) {
       throw new InvalidUserInputError("Must provide at least one source parameter");
     }
@@ -137,6 +140,21 @@ public OperationOutcome execute(@Nonnull @ResourceParam final Parameters inParam
           .map(param -> ImportMode.fromCode(
               ((CodeType) param.getValue()).asStringValue()))
           .orElse(ImportMode.OVERWRITE);
+
+      // Get the serialized resource type from the source parameter.
+      final ImportFormat format = sourceParam.getPart().stream()
+          .filter(param -> "format".equals(param.getName()))
+          .findFirst()
+          .map(param -> {
+            final String formatCode = ((StringType) param.getValue()).getValue();
+            try {
+              return ImportFormat.fromCode(formatCode);
+            } catch (final IllegalArgumentException e) {
+              throw new InvalidUserInputError("Unsupported format: " + formatCode);
+            }
+          })
+          .orElse(ImportFormat.NDJSON);
+
       final String resourceCode = ((CodeType) resourceTypeParam.getValue()).getCode();
       final ResourceType resourceType = ResourceType.fromCode(resourceCode);
 
@@ -149,17 +167,13 @@ public OperationOutcome execute(@Nonnull @ResourceParam final Parameters inParam
       }
 
       // Read the resources from the source URL into a dataset of strings.
-      final Dataset<String> jsonStrings = readStringsFromUrl(urlParam);
-
-      // Parse each line into a HAPI FHIR object, then encode to a Spark dataset.
-      final Dataset<IBaseResource> resources = jsonStrings.map(jsonToResourceConverter(),
-          fhirEncoder);
+      final Dataset<Row> rows = readRowsFromUrl(urlParam, format, fhirEncoder);
 
       log.info("Importing {} resources (mode: {})", resourceType.toCode(), importMode.getCode());
       if (importMode == ImportMode.OVERWRITE) {
-        database.overwrite(resourceType, resources.toDF());
+        database.overwrite(resourceType, rows);
       } else {
-        database.merge(resourceType, resources.toDF());
+        database.merge(resourceType, rows);
       }
     }
 
@@ -177,22 +191,38 @@ public OperationOutcome execute(@Nonnull @ResourceParam final Parameters inParam
   }
 
   @Nonnull
-  private Dataset<String> readStringsFromUrl(@Nonnull final ParametersParameterComponent urlParam) {
+  private Dataset<Row> readRowsFromUrl(@Nonnull final ParametersParameterComponent urlParam,
+      final ImportFormat format, final ExpressionEncoder<IBaseResource> fhirEncoder) {
     final String url = ((UrlType) urlParam.getValue()).getValueAsString();
     final String decodedUrl = URLDecoder.decode(url, StandardCharsets.UTF_8);
     final String convertedUrl = FileSystemPersistence.convertS3ToS3aUrl(decodedUrl);
-    final Dataset<String> jsonStrings;
+    final Dataset<Row> rowDataset;
     try {
       // Check that the user is authorized to execute the operation.
       accessRules.ifPresent(ar -> ar.checkCanImportFrom(convertedUrl));
       final FilterFunction<String> nonBlanks = s -> !s.isBlank();
-      jsonStrings = spark.read().textFile(convertedUrl).filter(nonBlanks);
+
+      rowDataset = switch (format) {
+        case NDJSON ->
+            // Parse each line into a HAPI FHIR object, then encode to a Spark dataset.
+            spark.read()
+                .textFile(convertedUrl).filter(nonBlanks)
+                .map(jsonToResourceConverter(), fhirEncoder)
+                .toDF();
+        case PARQUET ->
+            // Use the Spark Parquet reader.
+            spark.read()
+                .parquet(convertedUrl);
+        case DELTA ->
+            // Use the Delta Lake reader.
+            DeltaTable.forPath(spark, convertedUrl).toDF();
+      };
     } catch (final SecurityError e) {
       throw new InvalidUserInputError("Not allowed to import from URL: " + convertedUrl, e);
     } catch (final Exception e) {
       throw new InvalidUserInputError("Error reading from URL: " + convertedUrl, e);
     }
-    return jsonStrings;
+    return rowDataset;
   }
 
   @Nonnull
diff --git a/fhir-server/src/main/java/au/csiro/pathling/update/ImportFormat.java b/fhir-server/src/main/java/au/csiro/pathling/update/ImportFormat.java
new file mode 100644
index 0000000000..4f49f1b32b
--- /dev/null
+++ b/fhir-server/src/main/java/au/csiro/pathling/update/ImportFormat.java
@@ -0,0 +1,62 @@
+/*
+ * Copyright 2025 Commonwealth Scientific and Industrial Research
+ * Organisation (CSIRO) ABN 41 687 119 230.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package au.csiro.pathling.update;
+
+import lombok.Getter;
+
+/**
+ * Represents the supported formats for resource import.
+ */
+@Getter
+public enum ImportFormat {
+  /**
+   * Newline-delimited JSON (NDJSON) format.
+   */
+  NDJSON("ndjson"),
+  /**
+   * Parquet format.
+   */
+  PARQUET("parquet"),
+  /**
+   * Delta Lake format.
+   */
+  DELTA("delta");
+
+  private final String code;
+
+  ImportFormat(final String code) {
+    this.code = code;
+  }
+
+  /**
+   * Resolve an ImportFormat enum from its string code.
+   *
+   * @param code The string code to resolve.
+   * @return An ImportFormat if a match is found.
+   * @throws IllegalArgumentException if no match can be found.
+   */
+  public static ImportFormat fromCode(final String code) {
+    for (final ImportFormat format : ImportFormat.values()) {
+      if (format.getCode().equalsIgnoreCase(code)) {
+        return format;
+      }
+    }
+    throw new IllegalArgumentException("Unsupported format: " + code);
+  }
+  
+}
diff --git a/fhir-server/src/main/resources/fhir/import.OperationDefinition.json b/fhir-server/src/main/resources/fhir/import.OperationDefinition.json
index 9c5709bcda..258e3801a7 100644
--- a/fhir-server/src/main/resources/fhir/import.OperationDefinition.json
+++ b/fhir-server/src/main/resources/fhir/import.OperationDefinition.json
@@ -47,6 +47,14 @@
           "max": "1",
           "documentation": "A value of 'overwrite' will cause all existing resources of the specified type to be deleted and replaced with the contents of the source file. A value of 'merge' will match existing resources with updated resources in the source file based on their ID, and either update the existing resources or add new resources as appropriate. The default value is 'overwrite'.",
           "type": "code"
+        },
+        {
+          "name": "format",
+          "use": "in",
+          "min": 0,
+          "max": "1",
+          "documentation": "Indicates the format of the source file. Possible values are 'ndjson', 'parquet' and 'delta'. The default value is 'ndjson'.",
+          "type": "code"
         }
       ]
     }
diff --git a/fhir-server/src/test/java/au/csiro/pathling/test/integration/modification/ImportTest.java b/fhir-server/src/test/java/au/csiro/pathling/test/integration/modification/ImportTest.java
index 90d39f3918..ae1cc10b09 100644
--- a/fhir-server/src/test/java/au/csiro/pathling/test/integration/modification/ImportTest.java
+++ b/fhir-server/src/test/java/au/csiro/pathling/test/integration/modification/ImportTest.java
@@ -72,20 +72,33 @@ class ImportTest extends ModificationTest {
 
   @SuppressWarnings("SameParameterValue")
   @Nonnull
-  Parameters buildImportParameters(@Nonnull final URL jsonURL,
+  Parameters buildImportParameters(@Nonnull final URL url,
       @Nonnull final ResourceType resourceType) {
     final Parameters parameters = new Parameters();
     final ParametersParameterComponent sourceParam = parameters.addParameter().setName("source");
     sourceParam.addPart().setName("resourceType").setValue(new CodeType(resourceType.toCode()));
-    sourceParam.addPart().setName("url").setValue(new UrlType(jsonURL.toExternalForm()));
+    sourceParam.addPart().setName("url").setValue(new UrlType(url.toExternalForm()));
     return parameters;
   }
 
   @SuppressWarnings("SameParameterValue")
   @Nonnull
-  Parameters buildImportParameters(@Nonnull final URL jsonURL,
-      @Nonnull final ResourceType resourceType, @Nonnull final ImportMode mode) {
-    final Parameters parameters = buildImportParameters(jsonURL, resourceType);
+  Parameters buildImportParameters(@Nonnull final URL url,
+      @Nonnull final ResourceType resourceType, @Nonnull final String format) {
+    final Parameters parameters = new Parameters();
+    final ParametersParameterComponent sourceParam = parameters.addParameter().setName("source");
+    sourceParam.addPart().setName("resourceType").setValue(new CodeType(resourceType.toCode()));
+    sourceParam.addPart().setName("url").setValue(new UrlType(url.toExternalForm()));
+    sourceParam.addPart().setName("format").setValue(new CodeType(format));
+    return parameters;
+  }
+
+  @SuppressWarnings("SameParameterValue")
+  @Nonnull
+  Parameters buildImportParameters(@Nonnull final URL url,
+      @Nonnull final ResourceType resourceType, @Nonnull final String format,
+      @Nonnull final ImportMode mode) {
+    final Parameters parameters = buildImportParameters(url, resourceType, format);
     final ParametersParameterComponent sourceParam = parameters.getParameter().stream()
         .filter(p -> p.getName().equals("source")).findFirst()
         .orElseThrow();
@@ -96,30 +109,26 @@ Parameters buildImportParameters(@Nonnull final URL jsonURL,
   @Test
   void importJsonFile() {
     final URL jsonURL = getResourceAsUrl("import/Patient.ndjson");
-    importExecutor.execute(buildImportParameters(jsonURL, ResourceType.PATIENT));
+    importExecutor.execute(buildImportParameters(jsonURL, ResourceType.PATIENT, "ndjson"));
 
     final Dataset<Row> result = database.read(ResourceType.PATIENT);
-    final Dataset<Row> expected = new DatasetBuilder(spark)
-        .withIdColumn()
-        .withRow("121503c8-9564-4b48-9086-a22df717948e")
-        .withRow("2b36c1e2-bbe1-45ae-8124-4adad2677702")
-        .withRow("7001ad9c-34d2-4eb5-8165-5fdc2147f469")
-        .withRow("8ee183e2-b3c0-4151-be94-b945d6aa8c6d")
-        .withRow("9360820c-8602-4335-8b50-c88d627a0c20")
-        .withRow("a7eb2ce7-1075-426c-addd-957b861b0e55")
-        .withRow("bbd33563-70d9-4f6d-a79a-dd1fc55f5ad9")
-        .withRow("beff242e-580b-47c0-9844-c1a68c36c5bf")
-        .withRow("e62e52ae-2d75-4070-a0ae-3cc78d35ed08")
-        .build();
+    assertPatientDatasetMatches(result);
+  }
 
-    DatasetAssert.of(result.select("id")).hasRows(expected);
+  @Test
+  void importJsonFileUsingDefault() {
+    final URL jsonURL = getResourceAsUrl("import/Patient.ndjson");
+    importExecutor.execute(buildImportParameters(jsonURL, ResourceType.PATIENT));
+
+    final Dataset<Row> result = database.read(ResourceType.PATIENT);
+    assertPatientDatasetMatches(result);
   }
 
   @Test
   void mergeJsonFile() {
     final URL jsonURL = getResourceAsUrl("import/Patient_updates.ndjson");
     importExecutor.execute(
-        buildImportParameters(jsonURL, ResourceType.PATIENT, ImportMode.MERGE));
+        buildImportParameters(jsonURL, ResourceType.PATIENT, "ndjson", ImportMode.MERGE));
 
     final Dataset<Row> result = database.read(ResourceType.PATIENT);
     final Dataset<Row> expected = new DatasetBuilder(spark)
@@ -143,14 +152,14 @@ void mergeJsonFile() {
   @Test
   void importJsonFileWithBlankLines() {
     final URL jsonURL = getResourceAsUrl("import/Patient_with_eol.ndjson");
-    importExecutor.execute(buildImportParameters(jsonURL, ResourceType.PATIENT));
+    importExecutor.execute(buildImportParameters(jsonURL, ResourceType.PATIENT, "ndjson"));
     assertEquals(9, database.read(ResourceType.PATIENT).count());
   }
 
   @Test
   void importJsonFileWithRecursiveDatatype() {
     final URL jsonURL = getResourceAsUrl("import/Questionnaire.ndjson");
-    importExecutor.execute(buildImportParameters(jsonURL, ResourceType.QUESTIONNAIRE));
+    importExecutor.execute(buildImportParameters(jsonURL, ResourceType.QUESTIONNAIRE, "ndjson"));
     final Dataset<Row> questionnaireDataset = database.read(ResourceType.QUESTIONNAIRE);
     assertEquals(1, questionnaireDataset.count());
 
@@ -182,6 +191,24 @@ void importJsonFileWithRecursiveDatatype() {
     DatasetAssert.of(expandedItemsDataset).hasRows(expectedDataset);
   }
 
+  @Test
+  void importParquetFile() {
+    final URL parquetURL = getResourceAsUrl("import/Patient.parquet");
+    importExecutor.execute(buildImportParameters(parquetURL, ResourceType.PATIENT, "parquet"));
+
+    final Dataset<Row> result = database.read(ResourceType.PATIENT);
+    assertPatientDatasetMatches(result);
+  }
+
+  @Test
+  void importDeltaFile() {
+    final URL deltaURL = getResourceAsUrl("import/Patient.delta");
+    importExecutor.execute(buildImportParameters(deltaURL, ResourceType.PATIENT, "delta"));
+
+    final Dataset<Row> result = database.read(ResourceType.PATIENT);
+    assertPatientDatasetMatches(result);
+  }
+
   @Test
   void throwsOnUnsupportedResourceType() {
     final List<ResourceType> resourceTypes = Arrays.asList(ResourceType.PARAMETERS,
@@ -190,8 +217,8 @@ void throwsOnUnsupportedResourceType() {
     for (final ResourceType resourceType : resourceTypes) {
       final InvalidUserInputError error = assertThrows(InvalidUserInputError.class,
           () -> importExecutor.execute(
-              buildImportParameters(new URL("file://some/url"),
-                  resourceType)), "Unsupported resource type: " + resourceType.toCode());
+              buildImportParameters(getResourceAsUrl("import/Patient.ndjson"),
+                  resourceType, "ndjson")), "Unsupported resource type: " + resourceType.toCode());
       assertEquals("Unsupported resource type: " + resourceType.toCode(), error.getMessage());
     }
   }
@@ -200,11 +227,37 @@ void throwsOnUnsupportedResourceType() {
   void throwsOnMissingId() {
     final URL jsonURL = getResourceAsUrl("import/Patient_missing_id.ndjson");
     final Exception error = assertThrows(Exception.class,
-        () -> importExecutor.execute(buildImportParameters(jsonURL, ResourceType.PATIENT)));
+        () -> importExecutor.execute(
+            buildImportParameters(jsonURL, ResourceType.PATIENT, "ndjson")));
     final BaseServerResponseException convertedError =
         ErrorHandlingInterceptor.convertError(error);
     assertInstanceOf(InvalidRequestException.class, convertedError);
     assertEquals("Encountered a resource with no ID", convertedError.getMessage());
   }
 
+  @Test
+  void throwsOnUnsupportedFormat() {
+    assertThrows(InvalidUserInputError.class,
+        () -> importExecutor.execute(
+            buildImportParameters(getResourceAsUrl("import/Patient.ndjson"),
+                ResourceType.PATIENT, "foo")), "Unsupported format: foo");
+  }
+
+  private void assertPatientDatasetMatches(@Nonnull final Dataset<Row> result) {
+    final Dataset<Row> expected = new DatasetBuilder(spark)
+        .withIdColumn()
+        .withRow("121503c8-9564-4b48-9086-a22df717948e")
+        .withRow("2b36c1e2-bbe1-45ae-8124-4adad2677702")
+        .withRow("7001ad9c-34d2-4eb5-8165-5fdc2147f469")
+        .withRow("8ee183e2-b3c0-4151-be94-b945d6aa8c6d")
+        .withRow("9360820c-8602-4335-8b50-c88d627a0c20")
+        .withRow("a7eb2ce7-1075-426c-addd-957b861b0e55")
+        .withRow("bbd33563-70d9-4f6d-a79a-dd1fc55f5ad9")
+        .withRow("beff242e-580b-47c0-9844-c1a68c36c5bf")
+        .withRow("e62e52ae-2d75-4070-a0ae-3cc78d35ed08")
+        .build();
+
+    DatasetAssert.of(result.select("id")).hasRows(expected);
+  }
+
 }
diff --git a/fhir-server/src/test/resources/import/Patient.delta/.part-00000-672fe062-8b0c-442b-868c-89803ac2dc1b-c000.snappy.parquet.crc b/fhir-server/src/test/resources/import/Patient.delta/.part-00000-672fe062-8b0c-442b-868c-89803ac2dc1b-c000.snappy.parquet.crc
new file mode 100644
index 0000000000..108162920a
Binary files /dev/null and b/fhir-server/src/test/resources/import/Patient.delta/.part-00000-672fe062-8b0c-442b-868c-89803ac2dc1b-c000.snappy.parquet.crc differ
diff --git a/fhir-server/src/test/resources/import/Patient.delta/.part-00000-b3c5e8be-3b6c-4e9c-8d65-eb2ef157cd95-c000.snappy.parquet.crc b/fhir-server/src/test/resources/import/Patient.delta/.part-00000-b3c5e8be-3b6c-4e9c-8d65-eb2ef157cd95-c000.snappy.parquet.crc
new file mode 100644
index 0000000000..a95845523b
Binary files /dev/null and b/fhir-server/src/test/resources/import/Patient.delta/.part-00000-b3c5e8be-3b6c-4e9c-8d65-eb2ef157cd95-c000.snappy.parquet.crc differ
diff --git a/fhir-server/src/test/resources/import/Patient.delta/_delta_log/.00000000000000000000.json.crc b/fhir-server/src/test/resources/import/Patient.delta/_delta_log/.00000000000000000000.json.crc
new file mode 100644
index 0000000000..caac7a091b
Binary files /dev/null and b/fhir-server/src/test/resources/import/Patient.delta/_delta_log/.00000000000000000000.json.crc differ
diff --git a/fhir-server/src/test/resources/import/Patient.delta/_delta_log/.00000000000000000001.json.crc b/fhir-server/src/test/resources/import/Patient.delta/_delta_log/.00000000000000000001.json.crc
new file mode 100644
index 0000000000..ee731e636c
Binary files /dev/null and b/fhir-server/src/test/resources/import/Patient.delta/_delta_log/.00000000000000000001.json.crc differ
diff --git a/fhir-server/src/test/resources/import/Patient.delta/_delta_log/00000000000000000000.json b/fhir-server/src/test/resources/import/Patient.delta/_delta_log/00000000000000000000.json
new file mode 100644
index 0000000000..62682abdff
--- /dev/null
+++ b/fhir-server/src/test/resources/import/Patient.delta/_delta_log/00000000000000000000.json
@@ -0,0 +1,4 @@
+{"commitInfo":{"timestamp":1714419346723,"operation":"WRITE","operationParameters":{"mode":"Overwrite","partitionBy":"[]"},"isolationLevel":"Serializable","isBlindAppend":false,"operationMetrics":{"numFiles":"1","numOutputRows":"9","numOutputBytes":"132841"},"engineInfo":"Apache-Spark/3.5.0 Delta-Lake/3.1.0","txnId":"097cb991-0104-4ece-882d-ab61f55553ea"}}
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+{"protocol":{"minReaderVersion":1,"minWriterVersion":2}}
+{"add":{"path":"part-00000-b3c5e8be-3b6c-4e9c-8d65-eb2ef157cd95-c000.snappy.parquet","partitionValues":{},"size":132841,"modificationTime":1714419346677,"dataChange":true,"stats":"{\"numRecords\":9,\"minValues\":{\"id\":\"121503c8-9564-4b48-9086-a22df717\",\"id_versioned\":\"Patient/121503c8-9564-4b48-9086-\",\"meta\":{\"_fid\":154178315},\"text\":{\"status\":\"generated\",\"div\":\"<div xmlns=\\\"http://www.w3.org/19\",\"_fid\":863073070},\"gender\":\"female\",\"birthDate\":\"1957-06-06\",\"deceasedDateTime\":\"1967-06-08T08:27:40+00:00\",\"maritalStatus\":{\"text\":\"M\",\"_fid\":343536599}},\"maxValues\":{\"id\":\"e62e52ae-2d75-4070-a0ae-3cc78d35�\",\"id_versioned\":\"Patient/e62e52ae-2d75-4070-a0ae-�\",\"meta\":{\"_fid\":1607670030},\"text\":{\"status\":\"generated\",\"div\":\"<div xmlns=\\\"http://www.w3.org/19�\",\"_fid\":2121480375},\"gender\":\"male\",\"birthDate\":\"1998-12-26\",\"deceasedDateTime\":\"2018-02-17T09:11:55+00:00\",\"maritalStatus\":{\"text\":\"S\",\"_fid\":2145249203}},\"nullCount\":{\"id\":0,\"id_versioned\":0,\"meta\":{\"id\":9,\"versionId\":9,\"versionId_versioned\":9,\"lastUpdated\":9,\"source\":9,\"profile\":0,\"security\":0,\"tag\":0,\"_fid\":0},\"implicitRules\":9,\"language\":9,\"text\":{\"id\":9,\"status\":0,\"div\":0,\"_fid\":0},\"identifier\":0,\"active\":9,\"name\":0,\"telecom\":0,\"gender\":0,\"birthDate\":0,\"deceasedBoolean\":9,\"deceasedDateTime\":5,\"address\":0,\"maritalStatus\":{\"id\":9,\"coding\":0,\"text\":0,\"_fid\":0},\"multipleBirthBoolean\":0,\"multipleBirthInteger\":9}}"}}
diff --git a/fhir-server/src/test/resources/import/Patient.delta/_delta_log/00000000000000000001.json b/fhir-server/src/test/resources/import/Patient.delta/_delta_log/00000000000000000001.json
new file mode 100644
index 0000000000..88605bcc52
--- /dev/null
+++ b/fhir-server/src/test/resources/import/Patient.delta/_delta_log/00000000000000000001.json
@@ -0,0 +1,3 @@
+{"commitInfo":{"timestamp":1736902211723,"operation":"WRITE","operationParameters":{"mode":"Overwrite","partitionBy":"[]"},"readVersion":0,"isolationLevel":"Serializable","isBlindAppend":false,"operationMetrics":{"numFiles":"1","numOutputRows":"9","numOutputBytes":"131068"},"engineInfo":"Apache-Spark/3.5.0 Delta-Lake/3.2.0","txnId":"35a6f069-9b81-4eba-84ca-49caf72a4fab"}}
+{"add":{"path":"part-00000-672fe062-8b0c-442b-868c-89803ac2dc1b-c000.snappy.parquet","partitionValues":{},"size":131068,"modificationTime":1736902211147,"dataChange":true,"stats":"{\"numRecords\":9,\"minValues\":{\"id\":\"121503c8-9564-4b48-9086-a22df717\",\"id_versioned\":\"Patient/121503c8-9564-4b48-9086-\",\"meta\":{},\"text\":{\"status\":\"generated\",\"div\":\"<div xmlns=\\\"http://www.w3.org/19\",\"_fid\":189809872},\"gender\":\"female\",\"birthDate\":\"1957-06-06\",\"deceasedDateTime\":\"1967-06-08T08:27:40+00:00\",\"maritalStatus\":{\"text\":\"M\",\"_fid\":93571182}},\"maxValues\":{\"id\":\"e62e52ae-2d75-4070-a0ae-3cc78d35�\",\"id_versioned\":\"Patient/e62e52ae-2d75-4070-a0ae-�\",\"meta\":{},\"text\":{\"status\":\"generated\",\"div\":\"<div xmlns=\\\"http://www.w3.org/19�\",\"_fid\":2104429834},\"gender\":\"male\",\"birthDate\":\"1998-12-26\",\"deceasedDateTime\":\"2018-02-17T09:11:55+00:00\",\"maritalStatus\":{\"text\":\"S\",\"_fid\":1857434360}},\"nullCount\":{\"id\":0,\"id_versioned\":0,\"meta\":{\"id\":9,\"versionId\":9,\"versionId_versioned\":9,\"lastUpdated\":9,\"source\":9,\"profile\":9,\"security\":9,\"tag\":9,\"_fid\":9},\"implicitRules\":9,\"language\":9,\"text\":{\"id\":9,\"status\":0,\"div\":0,\"_fid\":0},\"identifier\":0,\"active\":9,\"name\":0,\"telecom\":0,\"gender\":0,\"birthDate\":0,\"deceasedBoolean\":9,\"deceasedDateTime\":5,\"address\":0,\"maritalStatus\":{\"id\":9,\"coding\":0,\"text\":0,\"_fid\":0},\"multipleBirthBoolean\":0,\"multipleBirthInteger\":9}}"}}
+{"remove":{"path":"part-00000-b3c5e8be-3b6c-4e9c-8d65-eb2ef157cd95-c000.snappy.parquet","deletionTimestamp":1736902211707,"dataChange":true,"extendedFileMetadata":true,"partitionValues":{},"size":132841}}
diff --git a/fhir-server/src/test/resources/import/Patient.delta/part-00000-672fe062-8b0c-442b-868c-89803ac2dc1b-c000.snappy.parquet b/fhir-server/src/test/resources/import/Patient.delta/part-00000-672fe062-8b0c-442b-868c-89803ac2dc1b-c000.snappy.parquet
new file mode 100644
index 0000000000..531b009396
Binary files /dev/null and b/fhir-server/src/test/resources/import/Patient.delta/part-00000-672fe062-8b0c-442b-868c-89803ac2dc1b-c000.snappy.parquet differ
diff --git a/fhir-server/src/test/resources/import/Patient.delta/part-00000-b3c5e8be-3b6c-4e9c-8d65-eb2ef157cd95-c000.snappy.parquet b/fhir-server/src/test/resources/import/Patient.delta/part-00000-b3c5e8be-3b6c-4e9c-8d65-eb2ef157cd95-c000.snappy.parquet
new file mode 100644
index 0000000000..f4b7345dc1
Binary files /dev/null and b/fhir-server/src/test/resources/import/Patient.delta/part-00000-b3c5e8be-3b6c-4e9c-8d65-eb2ef157cd95-c000.snappy.parquet differ
diff --git a/fhir-server/src/test/resources/import/Patient.parquet/._SUCCESS.crc b/fhir-server/src/test/resources/import/Patient.parquet/._SUCCESS.crc
new file mode 100644
index 0000000000..3b7b044936
Binary files /dev/null and b/fhir-server/src/test/resources/import/Patient.parquet/._SUCCESS.crc differ
diff --git a/fhir-server/src/test/resources/import/Patient.parquet/.part-00000-79c9ad61-dc37-46bb-9de3-3b890bbc4f3d-c000.snappy.parquet.crc b/fhir-server/src/test/resources/import/Patient.parquet/.part-00000-79c9ad61-dc37-46bb-9de3-3b890bbc4f3d-c000.snappy.parquet.crc
new file mode 100644
index 0000000000..de431b0bbb
Binary files /dev/null and b/fhir-server/src/test/resources/import/Patient.parquet/.part-00000-79c9ad61-dc37-46bb-9de3-3b890bbc4f3d-c000.snappy.parquet.crc differ
diff --git a/fhir-server/src/test/resources/import/Patient.parquet/_SUCCESS b/fhir-server/src/test/resources/import/Patient.parquet/_SUCCESS
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/fhir-server/src/test/resources/import/Patient.parquet/part-00000-79c9ad61-dc37-46bb-9de3-3b890bbc4f3d-c000.snappy.parquet b/fhir-server/src/test/resources/import/Patient.parquet/part-00000-79c9ad61-dc37-46bb-9de3-3b890bbc4f3d-c000.snappy.parquet
new file mode 100644
index 0000000000..b29a12d18f
Binary files /dev/null and b/fhir-server/src/test/resources/import/Patient.parquet/part-00000-79c9ad61-dc37-46bb-9de3-3b890bbc4f3d-c000.snappy.parquet differ
diff --git a/site/docs/server/operations/import.md b/site/docs/server/operations/import.md
index 6a7f3f8021..3ae80bfe10 100644
--- a/site/docs/server/operations/import.md
+++ b/site/docs/server/operations/import.md
@@ -9,12 +9,19 @@ description: The import operation allows FHIR data to be imported into the serve
 
 This operation allows FHIR R4 data to be imported into the server, making it
 available for query via other operations such
-as [search](./search), [aggregate](./aggregate) and [extract](./extract). This
-operation accepts the [NDJSON](https://hl7.org/fhir/R4/nd-json.html) format, and
-links to retrieve that data are provided rather that sending the data inline
-within the request itself. This is to allow for large data sets to be imported
+as [search](./search), [aggregate](./aggregate) and [extract](./extract). Links
+to retrieve that data are provided rather that sending the data inline within
+the request itself. This is to allow for large data sets to be imported
 efficiently.
 
+Source formats currently supported are:
+
+* [NDJSON](https://hl7.org/fhir/R4/nd-json.html) format
+* [Parquet](https://parquet.apache.org/) conforming to
+  the [Pathling schema](../../libraries/encoders/schema)
+* [Delta Lake](https://delta.io/) conforming to
+  the [Pathling schema](../../libraries/encoders/schema)
+
 Currently Pathling supports retrieval of NDJSON files from
 [Amazon S3](https://aws.amazon.com/s3/) (`s3://`),
 [HDFS](https://hadoop.apache.org/docs/r1.2.1/hdfs_design.html) (`hdfs://`) and
@@ -61,6 +68,9 @@ following parameters:
       resources with updated resources in the source file based on their ID, and
       either update the existing resources or add new resources as appropriate.
       The default value is `overwrite`.
+    - `format [0..1] (code)` - Indicates the format of the source file.
+      Possible values are `ndjson`, `parquet` and `delta`. The default value
+      is `ndjson`.
 
 ## Response