diff --git a/packages/data-designer-config/src/data_designer/logging.py b/packages/data-designer-config/src/data_designer/logging.py
index 3a280eae7..a514e770d 100644
--- a/packages/data-designer-config/src/data_designer/logging.py
+++ b/packages/data-designer-config/src/data_designer/logging.py
@@ -114,7 +114,11 @@ def working() -> str:
         return random.choice(["⚙️", "🔧", "🔨", "⚒️", "🛠️", "💼", "👷", "🏗️", "🪛", "👨‍💻"])
 
 
+_configured = False
+
+
 def configure_logging(config: LoggingConfig | None = None) -> None:
+    global _configured
     config = config or LoggingConfig.default()
 
     root_logger = logging.getLogger()
@@ -137,6 +141,8 @@ def configure_logging(config: LoggingConfig | None = None) -> None:
     for name in config.to_silence:
         quiet_noisy_logger(name)
 
+    _configured = True
+
 
 def quiet_noisy_logger(name: str) -> None:
     logger = logging.getLogger(name)
diff --git a/packages/data-designer-config/tests/test_logging.py b/packages/data-designer-config/tests/test_logging.py
index e52c0f1e1..2eaa9d6a2 100644
--- a/packages/data-designer-config/tests/test_logging.py
+++ b/packages/data-designer-config/tests/test_logging.py
@@ -17,6 +17,14 @@
     quiet_noisy_logger,
 )
 
+import data_designer.logging as _logging_mod
+
+@pytest.fixture(autouse=True)
+def reset_configured_flag():
+    original = _logging_mod._configured
+    yield
+    _logging_mod._configured = original
+
 
 @pytest.fixture
 def stub_default_logging_config():
diff --git a/packages/data-designer/src/data_designer/interface/data_designer.py b/packages/data-designer/src/data_designer/interface/data_designer.py
index 58dcb3f8b..be7979175 100644
--- a/packages/data-designer/src/data_designer/interface/data_designer.py
+++ b/packages/data-designer/src/data_designer/interface/data_designer.py
@@ -77,7 +77,9 @@ def _initialize_interface_runtime() -> None:
     global _interface_runtime_initialized
     if _interface_runtime_initialized:
         return
-    configure_logging()
+    from data_designer import logging as _logging_mod
+    if not _logging_mod._configured:
+        configure_logging()
     resolve_seed_default_model_settings()
     _interface_runtime_initialized = True
 
diff --git a/packages/data-designer/tests/interface/test_data_designer.py b/packages/data-designer/tests/interface/test_data_designer.py
index f3a517383..c6eb83236 100644
--- a/packages/data-designer/tests/interface/test_data_designer.py
+++ b/packages/data-designer/tests/interface/test_data_designer.py
@@ -455,6 +455,9 @@ def test_validate_raises_error_when_seed_collides(
 def test_initialize_interface_runtime_runs_once(monkeypatch: pytest.MonkeyPatch) -> None:
     """_initialize_interface_runtime only runs initialization once."""
     monkeypatch.setattr(dd_mod, "_interface_runtime_initialized", False)
+    
+    from data_designer import logging as _logging_mod
+    monkeypatch.setattr(_logging_mod, "_configured", False)
 
     with (
         patch("data_designer.interface.data_designer.configure_logging") as mock_logging,
@@ -464,3 +467,19 @@ def test_initialize_interface_runtime_runs_once(monkeypatch: pytest.MonkeyPatch)
         dd_mod._initialize_interface_runtime()
         mock_logging.assert_called_once()
         mock_resolve.assert_called_once()
+
+
+def test_initialize_interface_runtime_skips_logging_if_already_configured(monkeypatch: pytest.MonkeyPatch) -> None:
+    """_initialize_interface_runtime skips logging config if user already configured it."""
+    monkeypatch.setattr(dd_mod, "_interface_runtime_initialized", False)
+    
+    from data_designer import logging as _logging_mod
+    monkeypatch.setattr(_logging_mod, "_configured", True)
+
+    with (
+        patch("data_designer.interface.data_designer.configure_logging") as mock_logging,
+        patch("data_designer.interface.data_designer.resolve_seed_default_model_settings") as mock_resolve,
+    ):
+        dd_mod._initialize_interface_runtime()
+        mock_logging.assert_not_called()
+        mock_resolve.assert_called_once()