diff --git a/README.md b/README.md
index c1fe86e..1e70859 100644
--- a/README.md
+++ b/README.md
@@ -51,6 +51,11 @@ Do not forget to add the `structlog.stdlib.add_log_level` and optionally the
   as events. Default is `logging.WARNING`.
 - `active` A flag to make this processor enabled/disabled.
 - `as_context` Send `event_dict` as extra info to Sentry. Default is `True`.
+- `ignore_breadcrumb_data` A list of data keys that will be excluded from
+  [breadcrumb data](https://docs.sentry.io/platforms/python/enriching-events/breadcrumbs/#manual-breadcrumbs).
+  Defaults to keys which are already sent separately, i.e. `level`, `logger`,
+  `event` and `timestamp`. All other data in `event_dict` will be sent as
+  breadcrumb data.
 - `tag_keys` A list of keys. If any if these keys appear in `event_dict`,
   the key and its corresponding value in `event_dict` will be used as Sentry
   event tags. use `"__all__"` to report all key/value pairs of event as tags.
diff --git a/structlog_sentry/__init__.py b/structlog_sentry/__init__.py
index b532fe9..925ea81 100644
--- a/structlog_sentry/__init__.py
+++ b/structlog_sentry/__init__.py
@@ -38,6 +38,12 @@ def __init__(
         event_level: int = logging.WARNING,
         active: bool = True,
         as_context: bool = True,
+        ignore_breadcrumb_data: Iterable[str] = (
+            "level",
+            "logger",
+            "event",
+            "timestamp",
+        ),
         tag_keys: list[str] | str | None = None,
         ignore_loggers: Iterable[str] | None = None,
         verbose: bool = False,
@@ -51,6 +57,8 @@ def __init__(
         :param active: A flag to make this processor enabled/disabled.
         :param as_context: Send `event_dict` as extra info to Sentry.
             Default is :obj:`True`.
+        :param ignore_breadcrumb_data: A list of data keys that will be excluded from
+            breadcrumb data. Defaults to keys which are already sent separately.
         :param tag_keys: A list of keys. If any if these keys appear in `event_dict`,
             the key and its corresponding value in `event_dict` will be used as Sentry
             event tags. use `"__all__"` to report all key/value pairs of event as tags.
@@ -68,6 +76,7 @@ def __init__(
         self._hub = hub
         self._as_context = as_context
         self._original_event_dict: dict = {}
+        self.ignore_breadcrumb_data = ignore_breadcrumb_data
 
         self._ignored_loggers: set[str] = set()
         if ignore_loggers is not None:
@@ -131,13 +140,16 @@ def _get_event_and_hint(self, event_dict: EventDict) -> tuple[dict, dict]:
         return event, hint
 
     def _get_breadcrumb_and_hint(self, event_dict: EventDict) -> tuple[dict, dict]:
+        data = {
+            k: v for k, v in event_dict.items() if k not in self.ignore_breadcrumb_data
+        }
         event = {
             "type": "log",
             "level": event_dict.get("level"),  # type: ignore
             "category": event_dict.get("logger"),
             "message": event_dict["event"],
             "timestamp": event_dict.get("timestamp"),
-            "data": {},
+            "data": data,
         }
 
         return event, {"log_record": event_dict}
diff --git a/test/test_sentry_processor.py b/test/test_sentry_processor.py
index fd9ba27..ae2d5c8 100644
--- a/test/test_sentry_processor.py
+++ b/test/test_sentry_processor.py
@@ -10,7 +10,6 @@
     LoggingIntegration(event_level=None, level=None),
 ]
 
-
 # Register custom log level
 CUSTOM_LOG_LEVEL_NAME = "CUSTOM_LEVEL"
 CUSTOM_LOG_LEVEL_VALUE = logging.DEBUG
@@ -302,3 +301,72 @@ def test_sentry_json_respects_global_with_locals_option_with_locals(sentry_event
     for event in sentry_events:
         for frame in event["exception"]["values"][0]["stacktrace"]["frames"]:
             assert "vars" in frame  # Local variables were captured
+
+
+base_info_log = {
+    "level": "info",
+    "event": "Info message",
+    "logger": "EventLogger",
+    "timestamp": "2024-01-01T00:00:00Z",
+}
+base_error_log = {
+    "level": "error",
+    "event": "Error message",
+}
+
+
+def test_breadcrumbs_with_additional_data(sentry_events):
+    processor = SentryProcessor(verbose=True)
+    processor(None, None, {**base_info_log, **{"foo": "bar"}})
+    processor(None, None, base_error_log)
+    print({**base_info_log, **{"foo": "bar"}})
+    breadcrumbs = sentry_events[0]["breadcrumbs"]["values"]
+    del breadcrumbs[0]["timestamp"]
+    assert breadcrumbs[0] == {
+        "type": "log",
+        "level": "info",
+        "category": "EventLogger",
+        "message": "Info message",
+        "data": {"foo": "bar"},
+    }
+
+
+def test_breadcrumbs_with_custom_exclusions(sentry_events):
+    processor = SentryProcessor(verbose=True, ignore_breadcrumb_data=["foo"])
+    processor(None, None, {**base_info_log, **{"foo": "bar"}})
+    processor(None, None, base_error_log)
+
+    breadcrumbs = sentry_events[0]["breadcrumbs"]["values"]
+
+    del breadcrumbs[0]["timestamp"]
+    assert breadcrumbs[0] == {
+        "type": "log",
+        "level": "info",
+        "category": "EventLogger",
+        "message": "Info message",
+        "data": {
+            "level": "info",
+            "event": "Info message",
+            "logger": "EventLogger",
+            "timestamp": "2024-01-01T00:00:00Z",
+        },
+    }
+
+
+def test_breadcrumbs_with_no_additional_data(sentry_events):
+    processor = SentryProcessor(verbose=True)
+    processor(None, None, base_info_log)
+    processor(None, None, base_error_log)
+
+    breadcrumbs = sentry_events[0]["breadcrumbs"]["values"]
+
+    assert len(breadcrumbs) == 1
+    assert isinstance(breadcrumbs[0]["timestamp"], str)
+    del breadcrumbs[0]["timestamp"]
+    assert breadcrumbs[0] == {
+        "type": "log",
+        "level": "info",
+        "category": "EventLogger",
+        "message": "Info message",
+        "data": {},
+    }