diff --git a/reactivex/operators/__init__.py b/reactivex/operators/__init__.py
index ca386880..cbf9b551 100644
--- a/reactivex/operators/__init__.py
+++ b/reactivex/operators/__init__.py
@@ -3889,7 +3889,7 @@ def to_iterable() -> Callable[[Observable[_T]], Observable[List[_T]]]:
     There is also an alias called ``to_list``.
 
     Returns:
-        An operator function that takes an obserable source and
+        An operator function that takes an observable source and
         returns an observable sequence containing a single element with
         an iterable containing all the elements of the source sequence.
     """
diff --git a/reactivex/operators/_partition.py b/reactivex/operators/_partition.py
index 2f005e7d..26b03296 100644
--- a/reactivex/operators/_partition.py
+++ b/reactivex/operators/_partition.py
@@ -23,7 +23,7 @@ def partition(source: Observable[_T]) -> List[Observable[_T]]:
         when the source completes.
 
         Args:
-            source: Source obserable to partition.
+            source: Source observable to partition.
 
         Returns:
             A list of observables. The first triggers when the
diff --git a/reactivex/operators/_sequenceequal.py b/reactivex/operators/_sequenceequal.py
index d79a531b..a3019d6a 100644
--- a/reactivex/operators/_sequenceequal.py
+++ b/reactivex/operators/_sequenceequal.py
@@ -31,7 +31,7 @@ def sequence_equal(source: Observable[_T]) -> Observable[bool]:
             )
 
         Args:
-            source: Source obserable to compare.
+            source: Source observable to compare.
 
         Returns:
             An observable sequence that contains a single element which
diff --git a/reactivex/operators/_timeout.py b/reactivex/operators/_timeout.py
index 2e2d6e19..585f0b7b 100644
--- a/reactivex/operators/_timeout.py
+++ b/reactivex/operators/_timeout.py
@@ -36,7 +36,7 @@ def timeout(source: Observable[_T]) -> Observable[_T]:
             source: Source observable to timeout
 
         Returns:
-            An obserable sequence switching to the other sequence in
+            An observable sequence switching to the other sequence in
             case of a timeout.
         """