diff --git a/fern/openapi.json b/fern/openapi.json
index 29cb4eed..f3ebc9a0 100644
--- a/fern/openapi.json
+++ b/fern/openapi.json
@@ -10549,6 +10549,24 @@
             },
             "description": "Whether to sort agents oldest to newest (True) or newest to oldest (False, default). Deprecated in favor of order field.",
             "deprecated": true
+          },
+          {
+            "name": "project_id",
+            "in": "query",
+            "required": false,
+            "schema": {
+              "anyOf": [
+                {
+                  "type": "string"
+                },
+                {
+                  "type": "null"
+                }
+              ],
+              "description": "Filter runs by project ID.",
+              "title": "Project Id"
+            },
+            "description": "Filter runs by project ID."
           }
         ],
         "responses": {
diff --git a/letta/server/rest_api/routers/v1/internal_runs.py b/letta/server/rest_api/routers/v1/internal_runs.py
index fa603d23..7c8d8525 100644
--- a/letta/server/rest_api/routers/v1/internal_runs.py
+++ b/letta/server/rest_api/routers/v1/internal_runs.py
@@ -62,6 +62,7 @@ async def list_runs(
         description="Whether to sort agents oldest to newest (True) or newest to oldest (False, default). Deprecated in favor of order field.",
         deprecated=True,
     ),
+    project_id: Optional[str] = Query(None, description="Filter runs by project ID."),
     headers: HeaderParams = Depends(get_headers),
 ):
     """
@@ -103,5 +104,6 @@ async def list_runs(
         step_count=step_count,
         step_count_operator=step_count_operator,
         tools_used=tools_used,
+        project_id=project_id,
     )
     return runs
diff --git a/letta/services/run_manager.py b/letta/services/run_manager.py
index 6c16d5e3..ca6b74ce 100644
--- a/letta/services/run_manager.py
+++ b/letta/services/run_manager.py
@@ -14,7 +14,7 @@ from letta.orm.run_metrics import RunMetrics as RunMetricsModel
 from letta.orm.sqlalchemy_base import AccessType
 from letta.orm.step import Step as StepModel
 from letta.otel.tracing import log_event, trace_method
-from letta.schemas.enums import AgentType, ComparisonOperator, MessageRole, RunStatus, PrimitiveType
+from letta.schemas.enums import AgentType, ComparisonOperator, MessageRole, PrimitiveType, RunStatus
 from letta.schemas.job import LettaRequestConfig
 from letta.schemas.letta_message import LettaMessage, LettaMessageUnion
 from letta.schemas.letta_response import LettaResponse
@@ -112,6 +112,7 @@ class RunManager:
         step_count: Optional[int] = None,
         step_count_operator: ComparisonOperator = ComparisonOperator.EQ,
         tools_used: Optional[List[str]] = None,
+        project_id: Optional[str] = None,
     ) -> List[PydanticRun]:
         """List runs with filtering options."""
         async with db_registry.async_session() as session:
@@ -119,6 +120,10 @@ class RunManager:
 
             query = select(RunModel).filter(RunModel.organization_id == actor.organization_id)
 
+            # Filter by project_id if provided
+            if project_id:
+                query = query.filter(RunModel.project_id == project_id)
+
             # Handle agent filtering
             if agent_id:
                 agent_ids = [agent_id]