diff --git a/stubs/rx/backpressure/windowedobservable.pyi b/stubs/rx/backpressure/windowedobservable.pyi
new file mode 100644
--- /dev/null
+++ b/stubs/rx/backpressure/windowedobservable.pyi
@@ -0,0 +1,25 @@
+# Stubs for rx.backpressure.windowedobservable (Python 3)
+#
+# NOTE: This dynamically typed stub was automatically generated by stubgen.
+
+from rx.core import ObservableBase, ObserverBase
+from typing import Any, Optional
+
+log: Any
+
+class WindowedObserver(ObserverBase):
+    observer: Any = ...
+    observable: Any = ...
+    cancel: Any = ...
+    scheduler: Any = ...
+    received: int = ...
+    schedule_disposable: Any = ...
+    def __init__(self, observer: Any, observable: Any, cancel: Any, scheduler: Any) -> None: ...
+    def dispose(self) -> None: ...
+
+class WindowedObservable(ObservableBase):
+    source: Any = ...
+    window_size: Any = ...
+    scheduler: Any = ...
+    subscription: Any = ...
+    def __init__(self, source: Any, window_size: Any, scheduler: Optional[Any] = ...) -> None: ...