diff --git a/airflow-core/src/airflow/api_fastapi/core_api/datamodels/dags.py b/airflow-core/src/airflow/api_fastapi/core_api/datamodels/dags.py
index c8db6825a57c4..e461f9c62a638 100644
--- a/airflow-core/src/airflow/api_fastapi/core_api/datamodels/dags.py
+++ b/airflow-core/src/airflow/api_fastapi/core_api/datamodels/dags.py
@@ -91,7 +91,7 @@ def get_owners(cls, v: Any) -> list[str] | None:
         if v is None:
             return []
         if isinstance(v, str):
-            return v.split(",")
+            return [x.strip() for x in v.split(",")]
         return v
 
     @field_validator("timetable_summary", mode="before")