diff --git a/sentry_sdk/integrations/bottle.py b/sentry_sdk/integrations/bottle.py
index a973e6fbe3..51c9ba6d2e 100644
--- a/sentry_sdk/integrations/bottle.py
+++ b/sentry_sdk/integrations/bottle.py
@@ -192,29 +192,39 @@ def size_of_file(self, file: "FileUpload") -> int:
         return file.content_length
 
 
-def _set_segment_name_and_source(transaction_style: str) -> None:
+def _get_transaction_name(transaction_style: str, request: "Any") -> str:
     try:
         if transaction_style == "url":
-            name = bottle_request.route.rule or "bottle request"
+            return request.route.rule or "bottle request"
         else:
-            name = (
-                bottle_request.route.name
-                or transaction_from_function(bottle_request.route.callback)
+            return (
+                request.route.name
+                or transaction_from_function(request.route.callback)
                 or "bottle request"
             )
+    except RuntimeError:
+        return "bottle request"
+
 
+def _set_segment_name_and_source(transaction_style: str) -> None:
+    name = _get_transaction_name(transaction_style, bottle_request)
+    if name:
         sentry_sdk.get_current_scope().set_transaction_name(
             name,
             source=SEGMENT_SOURCE_FOR_STYLE[transaction_style],
         )
-    except RuntimeError:
-        pass
 
 
 def _make_request_event_processor(
     app: "Bottle", request: "LocalRequest", integration: "BottleIntegration"
 ) -> "EventProcessor":
     def event_processor(event: "Event", hint: "dict[str, Any]") -> "Event":
+        name = _get_transaction_name(integration.transaction_style, request)
+        event["transaction"] = name
+        event["transaction_info"] = {
+            "source": SEGMENT_SOURCE_FOR_STYLE[integration.transaction_style]
+        }
+
         with capture_internal_exceptions():
             BottleRequestExtractor(request).extract_into_event(event)
 
diff --git a/tests/integrations/bottle/test_bottle.py b/tests/integrations/bottle/test_bottle.py
index 0c4648bf2e..9798e8ded0 100644
--- a/tests/integrations/bottle/test_bottle.py
+++ b/tests/integrations/bottle/test_bottle.py
@@ -824,6 +824,34 @@ def index():
     assert "data" not in event.get("_meta", {}).get("request", {})
 
 
+def test_error_event_has_transaction_name(sentry_init, capture_events):
+    """
+    Error events captured during request handling should have the correct
+    transaction name set by the event processor, even though the inline
+    set_transaction_name call happens after the handler returns.
+    """
+    sentry_init(integrations=[BottleIntegration(transaction_style="url")])
+    events = capture_events()
+
+    app = Bottle()
+
+    @app.route("/error/<error_id>")
+    def error_handler(error_id):
+        1 / 0
+
+    client = Client(app)
+
+    try:
+        client.get("/error/123")
+    except ZeroDivisionError:
+        pass
+
+    (event,) = events
+    assert event["exception"]["values"][0]["type"] == "ZeroDivisionError"
+    assert event["transaction"] == "/error/<error_id>"
+    assert event["transaction_info"] == {"source": "route"}
+
+
 def test_oversized_request_body_not_annotated_data_collection(
     sentry_init, capture_events, app, get_client
 ):