diff --git a/src/prompt_toolkit/application/current.py b/src/prompt_toolkit/application/current.py
index e3a5b8769..33828024f 100644
--- a/src/prompt_toolkit/application/current.py
+++ b/src/prompt_toolkit/application/current.py
@@ -35,7 +35,7 @@ class AppSession:
 
     :param input: Use this as a default input for all applications
         running in this session, unless an input is passed to the `Application`
-        explicitely.
+        explicitly.
     :param output: Use this as a default output.
     """
 
diff --git a/src/prompt_toolkit/buffer.py b/src/prompt_toolkit/buffer.py
index b83934a6e..8edc01d1e 100644
--- a/src/prompt_toolkit/buffer.py
+++ b/src/prompt_toolkit/buffer.py
@@ -1589,12 +1589,12 @@ async def run() -> None:
                 # (We need to use `run_in_terminal`, because not all editors go to
                 # the alternate screen buffer, and some could influence the cursor
                 # position.)
-                succes = await run_in_terminal(
+                success = await run_in_terminal(
                     lambda: self._open_file_in_editor(filename), in_executor=True
                 )
 
                 # Read content again.
-                if succes:
+                if success:
                     with open(filename, "rb") as f:
                         text = f.read().decode("utf-8")
 
diff --git a/src/prompt_toolkit/contrib/telnet/server.py b/src/prompt_toolkit/contrib/telnet/server.py
index d2a79cae9..5730a3b0b 100644
--- a/src/prompt_toolkit/contrib/telnet/server.py
+++ b/src/prompt_toolkit/contrib/telnet/server.py
@@ -64,7 +64,7 @@ def _initialize_telnet(connection: socket.socket) -> None:
     connection.send(IAC + DO + NAWS)
 
     # Negotiate terminal type
-    # Assume the client will accept the negociation with `IAC +  WILL + TTYPE`
+    # Assume the client will accept the negotiation with `IAC +  WILL + TTYPE`
     connection.send(IAC + DO + TTYPE)
 
     # We can then select the first terminal type supported by the client,
diff --git a/src/prompt_toolkit/cursor_shapes.py b/src/prompt_toolkit/cursor_shapes.py
index adf6bca01..453b72c3c 100644
--- a/src/prompt_toolkit/cursor_shapes.py
+++ b/src/prompt_toolkit/cursor_shapes.py
@@ -26,7 +26,7 @@ class CursorShape(Enum):
     # before this `CursorShape` functionality was introduced into
     # prompt_toolkit itself, people had workarounds to send cursor shapes
     # escapes into the terminal, by monkey patching some of prompt_toolkit's
-    # internals. We don't want the default prompt_toolkit implemetation to
+    # internals. We don't want the default prompt_toolkit implementation to
     # interfere with that. E.g., IPython patches the `ViState.input_mode`
     # property. See: https://github.com/ipython/ipython/pull/13501/files
     _NEVER_CHANGE = "_NEVER_CHANGE"
diff --git a/src/prompt_toolkit/input/vt100.py b/src/prompt_toolkit/input/vt100.py
index 146790323..c1660de95 100644
--- a/src/prompt_toolkit/input/vt100.py
+++ b/src/prompt_toolkit/input/vt100.py
@@ -165,7 +165,7 @@ def callback_wrapper() -> None:
         loop.add_reader(fd, callback_wrapper)
     except PermissionError:
         # For `EPollSelector`, adding /dev/null to the event loop will raise
-        # `PermisisonError` (that doesn't happen for `SelectSelector`
+        # `PermissionError` (that doesn't happen for `SelectSelector`
         # apparently). Whenever we get a `PermissionError`, we can raise
         # `EOFError`, because there's not more to be read anyway. `EOFError` is
         # an exception that people expect in
diff --git a/src/prompt_toolkit/key_binding/bindings/vi.py b/src/prompt_toolkit/key_binding/bindings/vi.py
index d40baa017..436a553c1 100644
--- a/src/prompt_toolkit/key_binding/bindings/vi.py
+++ b/src/prompt_toolkit/key_binding/bindings/vi.py
@@ -1030,7 +1030,7 @@ def _swapcase_line(event: E) -> None:
         buff.transform_current_line(lambda s: s.swapcase())
 
     @handle("#", filter=vi_navigation_mode)
-    def _prev_occurence(event: E) -> None:
+    def _prev_occurrence(event: E) -> None:
         """
         Go to previous occurrence of this word.
         """
@@ -1043,7 +1043,7 @@ def _prev_occurence(event: E) -> None:
         b.apply_search(search_state, count=event.arg, include_current_position=False)
 
     @handle("*", filter=vi_navigation_mode)
-    def _next_occurance(event: E) -> None:
+    def _next_occurrence(event: E) -> None:
         """
         Go to next occurrence of this word.
         """
@@ -1411,7 +1411,7 @@ def _next_section(event: E) -> TextObject:
         return TextObject(index)
 
     @text_object("f", Keys.Any)
-    def _next_occurence(event: E) -> TextObject:
+    def _find_next_occurrence(event: E) -> TextObject:
         """
         Go to next occurrence of character. Typing 'fx' will move the
         cursor to the next occurrence of character. 'x'.
@@ -1426,7 +1426,7 @@ def _next_occurence(event: E) -> TextObject:
             return TextObject(0)
 
     @text_object("F", Keys.Any)
-    def _previous_occurance(event: E) -> TextObject:
+    def _find_previous_occurrence(event: E) -> TextObject:
         """
         Go to previous occurrence of character. Typing 'Fx' will move the
         cursor to the previous occurrence of character. 'x'.
diff --git a/src/prompt_toolkit/key_binding/key_bindings.py b/src/prompt_toolkit/key_binding/key_bindings.py
index 5e7b056af..6abb595da 100644
--- a/src/prompt_toolkit/key_binding/key_bindings.py
+++ b/src/prompt_toolkit/key_binding/key_bindings.py
@@ -58,7 +58,7 @@ def my_key_binding(event):
     # Avoid circular imports.
     from .key_processor import KeyPressEvent
 
-    # The only two return values for a mouse hander (and key bindings) are
+    # The only two return values for a mouse handler (and key bindings) are
     # `None` and `NotImplemented`. For the type checker it's best to annotate
     # this as `object`. (The consumer never expects a more specific instance:
     # checking for NotImplemented can be done using `is NotImplemented`.)
diff --git a/src/prompt_toolkit/layout/containers.py b/src/prompt_toolkit/layout/containers.py
index 2209ebdbd..bcbf35d05 100644
--- a/src/prompt_toolkit/layout/containers.py
+++ b/src/prompt_toolkit/layout/containers.py
@@ -2365,7 +2365,7 @@ def get_line_height(lineno: int) -> int:
             self.vertical_scroll_2 = min(
                 text_before_height - 1,  # Keep the cursor visible.
                 line_height
-                - height,  # Avoid blank lines at the bottom when scolling up again.
+                - height,  # Avoid blank lines at the bottom when scrolling up again.
                 self.vertical_scroll_2,
             )
             self.vertical_scroll_2 = max(
diff --git a/src/prompt_toolkit/layout/scrollable_pane.py b/src/prompt_toolkit/layout/scrollable_pane.py
index eac38610d..e38fd7619 100644
--- a/src/prompt_toolkit/layout/scrollable_pane.py
+++ b/src/prompt_toolkit/layout/scrollable_pane.py
@@ -39,9 +39,9 @@ class ScrollablePane(Container):
         top/bottom (left/right offset is not used).
     :param keep_cursor_visible: When `True`, automatically scroll the pane so
         that the cursor (of the focused window) is always visible.
-    :param keep_focused_window_visible: When `True`, automatically scroll th e
+    :param keep_focused_window_visible: When `True`, automatically scroll the
         pane so that the focused window is visible, or as much visible as
-        possible if it doen't completely fit the screen.
+        possible if it doesn't completely fit the screen.
     :param max_available_height: Always constraint the height to this amount
         for performance reasons.
     :param width: When given, use this width instead of looking at the children.
diff --git a/src/prompt_toolkit/output/base.py b/src/prompt_toolkit/output/base.py
index ff21f8599..6b06a50ee 100644
--- a/src/prompt_toolkit/output/base.py
+++ b/src/prompt_toolkit/output/base.py
@@ -206,7 +206,7 @@ def get_default_color_depth(self) -> ColorDepth:
         """
         Get default color depth for this output.
 
-        This value will be used if no color depth was explicitely passed to the
+        This value will be used if no color depth was explicitly passed to the
         `Application`.
 
         .. note::
diff --git a/src/prompt_toolkit/output/win32.py b/src/prompt_toolkit/output/win32.py
index 66e6a25bc..c93ec7de3 100644
--- a/src/prompt_toolkit/output/win32.py
+++ b/src/prompt_toolkit/output/win32.py
@@ -375,7 +375,7 @@ def flush(self) -> None:
             self.LOG.flush()
 
         # Print characters one by one. This appears to be the best solution
-        # in oder to avoid traces of vertical lines when the completion
+        # in order to avoid traces of vertical lines when the completion
         # menu disappears.
         for b in data:
             written = DWORD()
diff --git a/src/prompt_toolkit/utils.py b/src/prompt_toolkit/utils.py
index fef28beee..8cd9fae10 100644
--- a/src/prompt_toolkit/utils.py
+++ b/src/prompt_toolkit/utils.py
@@ -220,7 +220,7 @@ def in_main_thread() -> bool:
 
 def get_bell_environment_variable() -> bool:
     """
-    True if env variable is set to true (true, TRUE, TrUe, 1).
+    True if env variable is set to true (true, TRUE, True, 1).
     """
     value = os.environ.get("PROMPT_TOOLKIT_BELL", "true")
     return value.lower() in ("1", "true")