diff --git a/core/repository/sail/src/main/java/org/eclipse/rdf4j/repository/sail/SailRepositoryConnection.java b/core/repository/sail/src/main/java/org/eclipse/rdf4j/repository/sail/SailRepositoryConnection.java
index b14e54c1676..77bf29a32fa 100644
--- a/core/repository/sail/src/main/java/org/eclipse/rdf4j/repository/sail/SailRepositoryConnection.java
+++ b/core/repository/sail/src/main/java/org/eclipse/rdf4j/repository/sail/SailRepositoryConnection.java
@@ -168,6 +168,9 @@ public void begin() throws RepositoryException {
 	@Override
 	public void begin(IsolationLevel level) throws RepositoryException {
 		try {
+			// Call setIsolationLevel to update the AbstractRepositoryConnection's isolation level field
+			setIsolationLevel(level);
+
 			// always call receiveTransactionSettings(...) before calling begin();
 			sailConnection.setTransactionSettings();
 
@@ -195,6 +198,8 @@ public void begin(TransactionSetting... settings) {
 
 			for (TransactionSetting setting : settings) {
 				if (setting instanceof IsolationLevel) {
+					// Call setIsolationLevel to update the AbstractRepositoryConnection's isolation level field
+					setIsolationLevel((IsolationLevel) setting);
 					sailConnection.begin((IsolationLevel) setting);
 					return;
 				}
diff --git a/core/repository/sail/src/test/java/org/eclipse/rdf4j/repository/sail/SailRepositoryConnectionTest.java b/core/repository/sail/src/test/java/org/eclipse/rdf4j/repository/sail/SailRepositoryConnectionTest.java
index a51983aaf42..697397914ef 100644
--- a/core/repository/sail/src/test/java/org/eclipse/rdf4j/repository/sail/SailRepositoryConnectionTest.java
+++ b/core/repository/sail/src/test/java/org/eclipse/rdf4j/repository/sail/SailRepositoryConnectionTest.java
@@ -22,6 +22,8 @@
 import java.util.Optional;
 
 import org.eclipse.rdf4j.common.iteration.EmptyIteration;
+import org.eclipse.rdf4j.common.transaction.IsolationLevel;
+import org.eclipse.rdf4j.common.transaction.IsolationLevels;
 import org.eclipse.rdf4j.query.BooleanQuery;
 import org.eclipse.rdf4j.query.GraphQuery;
 import org.eclipse.rdf4j.query.Query;
@@ -29,6 +31,7 @@
 import org.eclipse.rdf4j.query.algebra.QueryRoot;
 import org.eclipse.rdf4j.query.algebra.TupleExpr;
 import org.eclipse.rdf4j.query.explanation.Explanation;
+import org.eclipse.rdf4j.sail.Sail;
 import org.eclipse.rdf4j.sail.SailConnection;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
@@ -169,4 +172,47 @@ public void testExplainQuery() {
 				anyBoolean(), anyInt());
 	}
 
+	@Test
+	public void testGetIsolationLevel_shouldReturnSetLevel() {
+		// Test that getIsolationLevel() returns the level set via begin(IsolationLevel)
+		assertThat(subject.getIsolationLevel()).isNull();
+
+		subject.begin(IsolationLevels.SERIALIZABLE);
+		assertThat(subject.getIsolationLevel()).isEqualTo(IsolationLevels.SERIALIZABLE);
+
+		subject.rollback();
+
+		subject.begin(IsolationLevels.READ_COMMITTED);
+		assertThat(subject.getIsolationLevel()).isEqualTo(IsolationLevels.READ_COMMITTED);
+
+		subject.rollback();
+	}
+
+	@Test
+	public void testGetIsolationLevel_shouldReturnSetLevelFromTransactionSettings() {
+		// Test that getIsolationLevel() returns the level set via begin(TransactionSetting...)
+		assertThat(subject.getIsolationLevel()).isNull();
+
+		subject.begin(IsolationLevels.READ_UNCOMMITTED);
+		assertThat(subject.getIsolationLevel()).isEqualTo(IsolationLevels.READ_UNCOMMITTED);
+
+		subject.rollback();
+	}
+
+	@Test
+	public void testGetIsolationLevel_shouldReturnDefaultLevelWhenNotExplicitlySet() {
+		// Test that getIsolationLevel() returns the default isolation level when begin() is called without parameters
+		assertThat(subject.getIsolationLevel()).isNull();
+
+		// Create a mock sail that returns the default isolation level
+		Sail mockSail = mock(Sail.class);
+		when(mockSail.getDefaultIsolationLevel()).thenReturn(IsolationLevels.READ_COMMITTED);
+		when(sailRepository.getSail()).thenReturn(mockSail);
+
+		subject.begin();
+		assertThat(subject.getIsolationLevel()).isEqualTo(IsolationLevels.READ_COMMITTED);
+
+		subject.rollback();
+	}
+
 }