diff --git a/src/textual/widgets/_content_switcher.py b/src/textual/widgets/_content_switcher.py
index aca1f6862..0d365fbf8 100644
--- a/src/textual/widgets/_content_switcher.py
+++ b/src/textual/widgets/_content_switcher.py
@@ -5,6 +5,7 @@ from __future__ import annotations
 from typing import Optional
 
 from ..containers import Container
+from ..events import Mount
 from ..reactive import reactive
 from ..widget import Widget
 
@@ -58,7 +59,7 @@ class ContentSwitcher(Container):
         )
         self._initial = initial
 
-    def on_mount(self) -> None:
+    def _on_mount(self, _: Mount) -> None:
         """Perform the initial setup of the widget once the DOM is ready."""
         initial = self._initial
         with self.app.batch_update():
diff --git a/src/textual/widgets/_data_table.py b/src/textual/widgets/_data_table.py
index efbdc65e4..0681c3993 100644
--- a/src/textual/widgets/_data_table.py
+++ b/src/textual/widgets/_data_table.py
@@ -887,11 +887,11 @@ class DataTable(ScrollView, Generic[CellType], can_focus=True):
             return self.header_height
         return self.rows[row_key].height
 
-    async def on_styles_updated(self) -> None:
+    async def _on_styles_updated(self) -> None:
         self._clear_caches()
         self.refresh()
 
-    def on_resize(self, event: events.Resize) -> None:
+    def _on_resize(self, _: events.Resize) -> None:
         self._update_count += 1
 
     def watch_show_cursor(self, show_cursor: bool) -> None:
@@ -1364,7 +1364,7 @@ class DataTable(ScrollView, Generic[CellType], can_focus=True):
         self._update_count += 1
         self.refresh(layout=True)
 
-    def on_idle(self) -> None:
+    async def _on_idle(self, _: events.Idle) -> None:
         """Runs when the message pump is empty.
 
         We use this for some expensive calculations like re-computing dimensions of the
@@ -1904,7 +1904,7 @@ class DataTable(ScrollView, Generic[CellType], can_focus=True):
 
         return self._render_line(y, scroll_x, scroll_x + width, self.rich_style)
 
-    def on_mouse_move(self, event: events.MouseMove):
+    def _on_mouse_move(self, event: events.MouseMove):
         """If the hover cursor is visible, display it by extracting the row
         and column metadata from the segments present in the cells."""
         self._set_hover_cursor(True)
@@ -1916,7 +1916,7 @@ class DataTable(ScrollView, Generic[CellType], can_focus=True):
             except KeyError:
                 pass
 
-    def on_leave(self, event: events.Leave) -> None:
+    def _on_leave(self, _: events.Leave) -> None:
         self._set_hover_cursor(False)
 
     def _get_fixed_offset(self) -> Spacing:
@@ -2001,7 +2001,7 @@ class DataTable(ScrollView, Generic[CellType], can_focus=True):
         elif cursor_type == "cell":
             self.refresh_coordinate(self.hover_coordinate)
 
-    def on_click(self, event: events.Click) -> None:
+    async def _on_click(self, event: events.Click) -> None:
         self._set_hover_cursor(True)
         meta = event.style.meta
         if not meta:
diff --git a/src/textual/widgets/_directory_tree.py b/src/textual/widgets/_directory_tree.py
index c197bfd68..64e52d38a 100644
--- a/src/textual/widgets/_directory_tree.py
+++ b/src/textual/widgets/_directory_tree.py
@@ -8,6 +8,7 @@ from typing import ClassVar, Iterable
 from rich.style import Style
 from rich.text import Text, TextType
 
+from ..events import Mount
 from ..message import Message
 from ._tree import TOGGLE_STYLE, Tree, TreeNode
 
@@ -180,10 +181,10 @@ class DirectoryTree(Tree[DirEntry]):
             )
         node.expand()
 
-    def on_mount(self) -> None:
+    def _on_mount(self, _: Mount) -> None:
         self.load_directory(self.root)
 
-    def on_tree_node_expanded(self, event: Tree.NodeSelected) -> None:
+    def _on_tree_node_expanded(self, event: Tree.NodeSelected) -> None:
         event.stop()
         dir_entry = event.node.data
         if dir_entry is None:
@@ -194,7 +195,7 @@ class DirectoryTree(Tree[DirEntry]):
         else:
             self.post_message(self.FileSelected(dir_entry.path))
 
-    def on_tree_node_selected(self, event: Tree.NodeSelected) -> None:
+    def _on_tree_node_selected(self, event: Tree.NodeSelected) -> None:
         event.stop()
         dir_entry = event.node.data
         if dir_entry is None:
diff --git a/src/textual/widgets/_header.py b/src/textual/widgets/_header.py
index 6dbdae79e..668105fa3 100644
--- a/src/textual/widgets/_header.py
+++ b/src/textual/widgets/_header.py
@@ -7,6 +7,7 @@ from datetime import datetime
 from rich.text import Text
 
 from ..app import RenderResult
+from ..events import Mount
 from ..reactive import Reactive
 from ..widget import Widget
 
@@ -67,7 +68,7 @@ class HeaderClock(HeaderClockSpace):
     }
     """
 
-    def on_mount(self) -> None:
+    def _on_mount(self, _: Mount) -> None:
         self.set_interval(1, callback=self.refresh, name=f"update header clock")
 
     def render(self) -> RenderResult:
@@ -156,10 +157,10 @@ class Header(Widget):
     def watch_tall(self, tall: bool) -> None:
         self.set_class(tall, "-tall")
 
-    def on_click(self):
+    def _on_click(self):
         self.toggle_class("-tall")
 
-    def on_mount(self) -> None:
+    def _on_mount(self, _: Mount) -> None:
         def set_title(title: str) -> None:
             self.query_one(HeaderTitle).text = title
 
diff --git a/src/textual/widgets/_input.py b/src/textual/widgets/_input.py
index da31e9904..9e5bf2d07 100644
--- a/src/textual/widgets/_input.py
+++ b/src/textual/widgets/_input.py
@@ -12,6 +12,7 @@ from rich.text import Text
 from .. import events
 from .._segment_tools import line_crop
 from ..binding import Binding, BindingType
+from ..events import Blur, Focus, Mount
 from ..geometry import Size
 from ..message import Message
 from ..reactive import reactive
@@ -299,22 +300,22 @@ class Input(Widget, can_focus=True):
         """Toggle visibility of cursor."""
         self._cursor_visible = not self._cursor_visible
 
-    def on_mount(self) -> None:
+    def _on_mount(self, _: Mount) -> None:
         self.blink_timer = self.set_interval(
             0.5,
             self._toggle_cursor,
             pause=not (self.cursor_blink and self.has_focus),
         )
 
-    def on_blur(self) -> None:
+    def _on_blur(self, _: Blur) -> None:
         self.blink_timer.pause()
 
-    def on_focus(self) -> None:
+    def _on_focus(self, _: Focus) -> None:
         self.cursor_position = len(self.value)
         if self.cursor_blink:
             self.blink_timer.resume()
 
-    async def on_key(self, event: events.Key) -> None:
+    async def _on_key(self, event: events.Key) -> None:
         self._cursor_visible = True
         if self.cursor_blink:
             self.blink_timer.reset()
@@ -330,12 +331,12 @@ class Input(Widget, can_focus=True):
             self.insert_text_at_cursor(event.character)
             event.prevent_default()
 
-    def on_paste(self, event: events.Paste) -> None:
+    def _on_paste(self, event: events.Paste) -> None:
         line = event.text.splitlines()[0]
         self.insert_text_at_cursor(line)
         event.stop()
 
-    def on_click(self, event: events.Click) -> None:
+    async def _on_click(self, event: events.Click) -> None:
         offset = event.get_content_offset(self)
         if offset is None:
             return
diff --git a/src/textual/widgets/_list_item.py b/src/textual/widgets/_list_item.py
index 75a1be7e9..bf3a43e28 100644
--- a/src/textual/widgets/_list_item.py
+++ b/src/textual/widgets/_list_item.py
@@ -47,7 +47,7 @@ class ListItem(Widget, can_focus=False):
             self.item = item
             super().__init__()
 
-    def on_click(self, event: events.Click) -> None:
+    async def _on_click(self, _: events.Click) -> None:
         self.post_message(self._ChildClicked(self))
 
     def watch_highlighted(self, value: bool) -> None:
diff --git a/src/textual/widgets/_list_view.py b/src/textual/widgets/_list_view.py
index 576475244..efd76d4d6 100644
--- a/src/textual/widgets/_list_view.py
+++ b/src/textual/widgets/_list_view.py
@@ -5,6 +5,7 @@ from typing import ClassVar, Optional
 from textual.await_remove import AwaitRemove
 from textual.binding import Binding, BindingType
 from textual.containers import VerticalScroll
+from textual.events import Mount
 from textual.geometry import clamp
 from textual.message import Message
 from textual.reactive import reactive
@@ -93,7 +94,7 @@ class ListView(VerticalScroll, can_focus=True, can_focus_children=False):
         )
         self._index = initial_index
 
-    def on_mount(self) -> None:
+    def _on_mount(self, _: Mount) -> None:
         """Ensure the ListView is fully-settled after mounting."""
         self.index = self._index
 
@@ -196,7 +197,7 @@ class ListView(VerticalScroll, can_focus=True, can_focus_children=False):
             return
         self.index -= 1
 
-    def on_list_item__child_clicked(self, event: ListItem._ChildClicked) -> None:
+    def _on_list_item__child_clicked(self, event: ListItem._ChildClicked) -> None:
         self.focus()
         self.index = self._nodes.index(event.item)
         self.post_message(self.Selected(self, event.item))
diff --git a/src/textual/widgets/_loading_indicator.py b/src/textual/widgets/_loading_indicator.py
index b2ac2f13c..a99d18e62 100644
--- a/src/textual/widgets/_loading_indicator.py
+++ b/src/textual/widgets/_loading_indicator.py
@@ -7,6 +7,7 @@ from rich.style import Style
 from rich.text import Text
 
 from ..color import Gradient
+from ..events import Mount
 from ..widget import Widget
 
 
@@ -22,7 +23,7 @@ class LoadingIndicator(Widget):
     }
     """
 
-    def on_mount(self) -> None:
+    def _on_mount(self, _: Mount) -> None:
         self._start_time = time()
         self.auto_refresh = 1 / 16
 
diff --git a/src/textual/widgets/_markdown.py b/src/textual/widgets/_markdown.py
index 69d632722..940fb43be 100644
--- a/src/textual/widgets/_markdown.py
+++ b/src/textual/widgets/_markdown.py
@@ -13,6 +13,7 @@ from typing_extensions import TypeAlias
 
 from ..app import ComposeResult
 from ..containers import Horizontal, VerticalScroll
+from ..events import Mount
 from ..message import Message
 from ..reactive import reactive, var
 from ..widget import Widget
@@ -587,7 +588,7 @@ class Markdown(Widget):
             self.href: str = href
             """The link that was selected."""
 
-    def on_mount(self) -> None:
+    def _on_mount(self, _: Mount) -> None:
         if self._markdown is not None:
             self.update(self._markdown)
 
@@ -801,7 +802,7 @@ class MarkdownTableOfContents(Widget, can_focus_children=True):
                     node = node.add(NUMERALS[level], expand=True)
             node.add_leaf(f"[dim]{NUMERALS[level]}[/] {name}", {"block_id": block_id})
 
-    async def on_tree_node_selected(self, message: Tree.NodeSelected) -> None:
+    async def _on_tree_node_selected(self, message: Tree.NodeSelected) -> None:
         node_data = message.node.data
         if node_data is not None:
             await self._post_message(
@@ -872,7 +873,7 @@ class MarkdownViewer(VerticalScroll, can_focus=True, can_focus_children=True):
         """The table of contents widget"""
         return self.query_one(MarkdownTableOfContents)
 
-    async def on_mount(self) -> None:
+    def _on_mount(self, _: Mount) -> None:
         if self._markdown is not None:
             self.document.update(self._markdown)
 
@@ -890,7 +891,7 @@ class MarkdownViewer(VerticalScroll, can_focus=True, can_focus_children=True):
         if self.navigator.forward():
             await self.document.load(self.navigator.location)
 
-    async def on_markdown_link_clicked(self, message: Markdown.LinkClicked) -> None:
+    async def _on_markdown_link_clicked(self, message: Markdown.LinkClicked) -> None:
         message.stop()
         await self.go(message.href)
 
@@ -901,7 +902,7 @@ class MarkdownViewer(VerticalScroll, can_focus=True, can_focus_children=True):
         yield MarkdownTableOfContents()
         yield Markdown(parser_factory=self._parser_factory)
 
-    def on_markdown_table_of_contents_updated(
+    def _on_markdown_table_of_contents_updated(
         self, message: Markdown.TableOfContentsUpdated
     ) -> None:
         self.query_one(
@@ -909,7 +910,7 @@ class MarkdownViewer(VerticalScroll, can_focus=True, can_focus_children=True):
         ).table_of_contents = message.table_of_contents
         message.stop()
 
-    def on_markdown_table_of_contents_selected(
+    def _on_markdown_table_of_contents_selected(
         self, message: Markdown.TableOfContentsSelected
     ) -> None:
         block_selector = f"#{message.block_id}"
diff --git a/src/textual/widgets/_option_list.py b/src/textual/widgets/_option_list.py
index fe3d4d31c..97744971a 100644
--- a/src/textual/widgets/_option_list.py
+++ b/src/textual/widgets/_option_list.py
@@ -16,7 +16,7 @@ from rich.style import Style
 from typing_extensions import Literal, Self, TypeAlias
 
 from ..binding import Binding, BindingType
-from ..events import Click, MouseMove
+from ..events import Click, Idle, Leave, MouseMove
 from ..geometry import Region, Size
 from ..message import Message
 from ..reactive import reactive
@@ -363,7 +363,7 @@ class OptionList(ScrollView, can_focus=True):
         self._needs_to_scroll_to_highlight = rescroll_to_highlight
         self.check_idle()
 
-    def on_idle(self) -> None:
+    async def _on_idle(self, _: Idle) -> None:
         """Perform content tracking data refresh when idle."""
         self._refresh_content_tracking()
         if self._needs_to_scroll_to_highlight:
@@ -380,11 +380,11 @@ class OptionList(ScrollView, can_focus=True):
         """
         self._request_content_tracking_refresh()
 
-    def on_resize(self) -> None:
+    def _on_resize(self) -> None:
         """Refresh the layout of the renderables in the list when resized."""
         self._request_content_tracking_refresh(rescroll_to_highlight=True)
 
-    def on_mouse_move(self, event: MouseMove) -> None:
+    def _on_mouse_move(self, event: MouseMove) -> None:
         """React to the mouse moving.
 
         Args:
@@ -392,11 +392,11 @@ class OptionList(ScrollView, can_focus=True):
         """
         self._mouse_hovering_over = event.style.meta.get("option")
 
-    def on_leave(self) -> None:
+    def _on_leave(self, _: Leave) -> None:
         """React to the mouse leaving the widget."""
         self._mouse_hovering_over = None
 
-    def on_click(self, event: Click) -> None:
+    async def _on_click(self, event: Click) -> None:
         """React to the mouse being clicked on an item.
 
         Args:
diff --git a/src/textual/widgets/_placeholder.py b/src/textual/widgets/_placeholder.py
index da5bce717..16c3b2f9b 100644
--- a/src/textual/widgets/_placeholder.py
+++ b/src/textual/widgets/_placeholder.py
@@ -156,11 +156,11 @@ class Placeholder(Widget):
             )
         return variant
 
-    def on_click(self) -> None:
+    async def _on_click(self, _: events.Click) -> None:
         """Click handler to cycle through the placeholder variants."""
         self.cycle_variant()
 
-    def on_resize(self, event: events.Resize) -> None:
+    def _on_resize(self, event: events.Resize) -> None:
         """Update the placeholder "size" variant with the new placeholder size."""
         self._renderables["size"] = self._SIZE_RENDER_TEMPLATE.format(*event.size)
         if self.variant == "size":
diff --git a/src/textual/widgets/_radio_set.py b/src/textual/widgets/_radio_set.py
index ad616b9e5..6ca9339a9 100644
--- a/src/textual/widgets/_radio_set.py
+++ b/src/textual/widgets/_radio_set.py
@@ -5,6 +5,7 @@ from __future__ import annotations
 import rich.repr
 
 from ..containers import Container
+from ..events import Mount
 from ..message import Message
 from ._radio_button import RadioButton
 
@@ -91,7 +92,7 @@ class RadioSet(Container):
             disabled=disabled,
         )
 
-    def on_mount(self) -> None:
+    def _on_mount(self, _: Mount) -> None:
         """Perform some processing once mounted in the DOM."""
 
         # It's possible for the user to pass in a collection of radio
@@ -108,7 +109,7 @@ class RadioSet(Container):
         if switched_on:
             self._pressed_button = switched_on[0]
 
-    def on_radio_button_changed(self, event: RadioButton.Changed) -> None:
+    def _on_radio_button_changed(self, event: RadioButton.Changed) -> None:
         """Respond to the value of a button in the set being changed.
 
         Args:
diff --git a/src/textual/widgets/_switch.py b/src/textual/widgets/_switch.py
index abccfd985..8542f5404 100644
--- a/src/textual/widgets/_switch.py
+++ b/src/textual/widgets/_switch.py
@@ -5,6 +5,7 @@ from typing import TYPE_CHECKING, ClassVar
 from rich.console import RenderableType
 
 from ..binding import Binding, BindingType
+from ..events import Click
 from ..geometry import Size
 from ..message import Message
 from ..reactive import reactive
@@ -153,7 +154,7 @@ class Switch(Widget, can_focus=True):
     def get_content_height(self, container: Size, viewport: Size, width: int) -> int:
         return 1
 
-    def on_click(self) -> None:
+    async def _on_click(self, _: Click) -> None:
         """Toggle the state of the switch."""
         self.toggle()
 
diff --git a/src/textual/widgets/_tabs.py b/src/textual/widgets/_tabs.py
index cdfaf2ac1..e06144619 100644
--- a/src/textual/widgets/_tabs.py
+++ b/src/textual/widgets/_tabs.py
@@ -11,6 +11,7 @@ from ..app import ComposeResult, RenderResult
 from ..binding import Binding, BindingType
 from ..containers import Container, Horizontal, Vertical
 from ..css.query import NoMatches
+from ..events import Mount
 from ..geometry import Offset
 from ..message import Message
 from ..reactive import reactive
@@ -73,7 +74,7 @@ class Underline(Widget):
             background_style=Style.from_color(bar_style.bgcolor),
         )
 
-    def on_click(self, event: events.Click):
+    def _on_click(self, event: events.Click):
         """Catch clicks, so that the underline can activate the tabs."""
         event.stop()
         self.post_message(self.Clicked(event.screen_offset))
@@ -379,7 +380,7 @@ class Tabs(Widget, can_focus=True):
         except NoMatches:
             return None
 
-    def on_mount(self) -> None:
+    def _on_mount(self, _: Mount) -> None:
         """Make the first tab active."""
         if self._first_active is not None:
             self.active = self._first_active
diff --git a/src/textual/widgets/_toggle_button.py b/src/textual/widgets/_toggle_button.py
index 6b4f76f8e..30f23e178 100644
--- a/src/textual/widgets/_toggle_button.py
+++ b/src/textual/widgets/_toggle_button.py
@@ -12,6 +12,7 @@ from rich.text import Text, TextType
 
 from ..app import RenderResult
 from ..binding import Binding, BindingType
+from ..events import Click
 from ..geometry import Size
 from ..message import Message
 from ..reactive import reactive
@@ -220,7 +221,7 @@ class ToggleButton(Static, can_focus=True):
         """
         self.toggle()
 
-    def on_click(self) -> None:
+    async def _on_click(self, _: Click) -> None:
         """Toggle the value of the widget when clicked with the mouse."""
         self.toggle()