diff --git a/crates/editor/src/actions.rs b/crates/editor/src/actions.rs
index 2ed935eb34..e4e280851d 100644
--- a/crates/editor/src/actions.rs
+++ b/crates/editor/src/actions.rs
@@ -397,6 +397,15 @@ actions!(
     ]
 );
 
+actions!(
+    markdown,
+    [
+        /// Toggles a block quote (`> `) prefix on the selected lines (or the
+        /// current line) while in Markdown files.
+        ToggleBlockQuote,
+    ]
+);
+
 actions!(
     editor,
     [
diff --git a/crates/editor/src/editor.rs b/crates/editor/src/editor.rs
index 1931146eb1..8eca77a5fa 100644
--- a/crates/editor/src/editor.rs
+++ b/crates/editor/src/editor.rs
@@ -66,6 +66,7 @@ mod config;
 mod diagnostics;
 mod edit_prediction;
 mod input;
+mod markdown_actions;
 mod navigation;
 mod rewrap;
 mod selection;
diff --git a/crates/editor/src/editor_tests.rs b/crates/editor/src/editor_tests.rs
index 8049ba14b0..1ce8c26a1b 100644
--- a/crates/editor/src/editor_tests.rs
+++ b/crates/editor/src/editor_tests.rs
@@ -38027,3 +38027,99 @@ async fn test_toggle_diagnostics_persists_across_settings_change(cx: &mut TestAp
         );
     });
 }
+
+#[gpui::test]
+async fn test_toggle_markdown_block_quote(cx: &mut TestAppContext) {
+    init_test(cx, |_| {});
+
+    let mut cx = EditorTestContext::new(cx).await;
+
+    // No-op with no language
+    cx.set_state(indoc! {"
+        «helloˇ» world
+    "});
+    cx.update_editor(|e, window, cx| e.toggle_markdown_block_quote(&ToggleBlockQuote, window, cx));
+    cx.assert_editor_state(indoc! {"
+        «helloˇ» world
+    "});
+
+    // No-op in non-Markdown language (Rust)
+    cx.update_buffer(|buffer, cx| buffer.set_language(Some(rust_lang()), cx));
+    cx.set_state(indoc! {"
+        «helloˇ» world
+    "});
+    cx.update_editor(|e, window, cx| e.toggle_markdown_block_quote(&ToggleBlockQuote, window, cx));
+    cx.assert_editor_state(indoc! {"
+        «helloˇ» world
+    "});
+
+    cx.update_buffer(|buffer, cx| buffer.set_language(Some(markdown_lang()), cx));
+
+    // Line is quoted with an empty selection
+    cx.set_state(indoc! {"
+        helˇlo world
+    "});
+    cx.update_editor(|e, window, cx| e.toggle_markdown_block_quote(&ToggleBlockQuote, window, cx));
+    cx.assert_editor_state(indoc! {"
+        «> hello worldˇ»
+    "});
+
+    // Line is unquoted with an empty selection
+    cx.update_editor(|e, window, cx| e.toggle_markdown_block_quote(&ToggleBlockQuote, window, cx));
+    cx.assert_editor_state(indoc! {"
+        «hello worldˇ»
+    "});
+
+    // Multi-line selection is quoted, including blank lines
+    cx.set_state(indoc! {"
+        «first
+
+        thirdˇ»
+    "});
+    cx.update_editor(|e, window, cx| e.toggle_markdown_block_quote(&ToggleBlockQuote, window, cx));
+    cx.assert_editor_state(indoc! {"
+        «> first
+        >
+        > thirdˇ»
+    "});
+
+    // Multi-line selection is unquoted, including blank lines
+    cx.update_editor(|e, window, cx| e.toggle_markdown_block_quote(&ToggleBlockQuote, window, cx));
+    cx.assert_editor_state(indoc! {"
+        «first
+
+        thirdˇ»
+    "});
+
+    // A multi-line selection, including a mixture of quoted and unquoted lines
+    // and a mixture of empty and non-empty lines, normalizes each line to a
+    // single quote.
+    cx.set_state(indoc! {"
+        «> first
+        second
+        >
+
+        > third
+        >fourthˇ»
+    "});
+    cx.update_editor(|e, window, cx| e.toggle_markdown_block_quote(&ToggleBlockQuote, window, cx));
+    cx.assert_editor_state(indoc! {"
+        «> first
+        > second
+        >
+        >
+        > third
+        > fourthˇ»
+    "});
+
+    // A multi-line selection is unquoted.
+    cx.update_editor(|e, window, cx| e.toggle_markdown_block_quote(&ToggleBlockQuote, window, cx));
+    cx.assert_editor_state(indoc! {"
+        «first
+        second
+
+
+        third
+        fourthˇ»
+    "});
+}
diff --git a/crates/editor/src/element.rs b/crates/editor/src/element.rs
index 0ac3b2691d..29fce5e6ad 100644
--- a/crates/editor/src/element.rs
+++ b/crates/editor/src/element.rs
@@ -571,6 +571,7 @@ impl EditorElement {
             register_action(editor, window, Editor::redo);
             register_action(editor, window, Editor::toggle_comments);
             register_action(editor, window, Editor::toggle_block_comments);
+            register_action(editor, window, Editor::toggle_markdown_block_quote);
             register_action(editor, window, Editor::unwrap_syntax_node);
             register_action(editor, window, Editor::accept_next_word_edit_prediction);
             register_action(editor, window, Editor::accept_next_line_edit_prediction);
diff --git a/crates/editor/src/markdown_actions.rs b/crates/editor/src/markdown_actions.rs
new file mode 100644
index 0000000000..2b6af38d0a
--- /dev/null
+++ b/crates/editor/src/markdown_actions.rs
@@ -0,0 +1,56 @@
+use super::*;
+
+impl Editor {
+    pub fn toggle_markdown_block_quote(
+        &mut self,
+        _: &ToggleBlockQuote,
+        window: &mut Window,
+        cx: &mut Context<Self>,
+    ) {
+        self.manipulate_mutable_lines_in_markdown(window, cx, |lines| {
+            let all_lines_quoted = lines.iter().all(|line| line.starts_with('>'));
+
+            for line in lines.iter_mut() {
+                let stripped_line = match line.strip_prefix("> ").or_else(|| line.strip_prefix('>'))
+                {
+                    Some(rest) => rest.to_string(),
+                    None => line.to_string(),
+                };
+
+                *line = if all_lines_quoted {
+                    Cow::Owned(stripped_line)
+                } else if stripped_line.trim().is_empty() {
+                    Cow::Borrowed(">")
+                } else {
+                    Cow::Owned(format!("> {stripped_line}"))
+                };
+            }
+        });
+    }
+
+    fn manipulate_mutable_lines_in_markdown<Fn>(
+        &mut self,
+        window: &mut Window,
+        cx: &mut Context<Self>,
+        callback: Fn,
+    ) where
+        Fn: FnMut(&mut Vec<Cow<'_, str>>),
+    {
+        if !self.is_in_markdown_language(cx) {
+            return;
+        }
+
+        self.manipulate_mutable_lines(window, cx, callback);
+    }
+
+    fn is_in_markdown_language(&self, cx: &mut App) -> bool {
+        let snapshot = self.buffer.read(cx).snapshot(cx);
+        let head = self
+            .selections
+            .newest::<MultiBufferOffset>(&self.display_snapshot(cx))
+            .head();
+        snapshot
+            .language_at(head)
+            .is_some_and(|language| language.name() == "Markdown")
+    }
+}