diff --git a/crates/agent_ui/src/agent_panel.rs b/crates/agent_ui/src/agent_panel.rs
index afce4d31c7a424276f7ad382bad480eac0595be8..997a2bec09aa2a0ae39909c909c7de80771c5055 100644
--- a/crates/agent_ui/src/agent_panel.rs
+++ b/crates/agent_ui/src/agent_panel.rs
@@ -72,7 +72,9 @@ use workspace::{
 };
 use zed_actions::{
     DecreaseBufferFontSize, IncreaseBufferFontSize, ResetBufferFontSize,
-    agent::{OpenAcpOnboardingModal, OpenOnboardingModal, OpenSettings, ResetOnboarding},
+    agent::{
+        OpenAcpOnboardingModal, OpenOnboardingModal, OpenSettings, ResetAgentZoom, ResetOnboarding,
+    },
     assistant::{OpenRulesLibrary, ToggleFocus},
 };
 
@@ -193,6 +195,13 @@ pub fn init(cx: &mut App) {
                 })
                 .register_action(|_workspace, _: &ResetTrialEndUpsell, _window, cx| {
                     TrialEndUpsell::set_dismissed(false, cx);
+                })
+                .register_action(|workspace, _: &ResetAgentZoom, window, cx| {
+                    if let Some(panel) = workspace.panel::<AgentPanel>(cx) {
+                        panel.update(cx, |panel, cx| {
+                            panel.reset_agent_zoom(window, cx);
+                        });
+                    }
                 });
         },
     )
@@ -1102,6 +1111,11 @@ impl AgentPanel {
         }
     }
 
+    pub fn reset_agent_zoom(&mut self, _window: &mut Window, cx: &mut Context<Self>) {
+        theme::reset_agent_ui_font_size(cx);
+        theme::reset_agent_buffer_font_size(cx);
+    }
+
     pub fn toggle_zoom(&mut self, _: &ToggleZoom, window: &mut Window, cx: &mut Context<Self>) {
         if self.zoomed {
             cx.emit(PanelEvent::ZoomOut);
diff --git a/crates/zed/src/zed.rs b/crates/zed/src/zed.rs
index 972b34b17cc7ae7f7dfee4ab3792eeb49aeba52b..12a1bc8d50b2916658877165c2eedef9c8ce235c 100644
--- a/crates/zed/src/zed.rs
+++ b/crates/zed/src/zed.rs
@@ -870,6 +870,24 @@ fn register_actions(
                 }
             }
         })
+        .register_action({
+            let fs = app_state.fs.clone();
+            move |_, action: &zed_actions::ResetAllZoom, _window, cx| {
+                if action.persist {
+                    update_settings_file(fs.clone(), cx, move |settings, _| {
+                        settings.theme.ui_font_size = None;
+                        settings.theme.buffer_font_size = None;
+                        settings.theme.agent_ui_font_size = None;
+                        settings.theme.agent_buffer_font_size = None;
+                    });
+                } else {
+                    theme::reset_ui_font_size(cx);
+                    theme::reset_buffer_font_size(cx);
+                    theme::reset_agent_ui_font_size(cx);
+                    theme::reset_agent_buffer_font_size(cx);
+                }
+            }
+        })
         .register_action(|_, _: &install_cli::RegisterZedScheme, window, cx| {
             cx.spawn_in(window, async move |workspace, cx| {
                 install_cli::register_zed_scheme(cx).await?;
diff --git a/crates/zed/src/zed/app_menus.rs b/crates/zed/src/zed/app_menus.rs
index 2baf4f708c29a7bec11e8aa26a1897a20a75e3c9..ac22f972368f61fa518ac74a5ac23e593433c75b 100644
--- a/crates/zed/src/zed/app_menus.rs
+++ b/crates/zed/src/zed/app_menus.rs
@@ -20,6 +20,10 @@ pub fn app_menus(cx: &mut App) -> Vec<Menu> {
             "Reset Zoom",
             zed_actions::ResetBufferFontSize { persist: false },
         ),
+        MenuItem::action(
+            "Reset All Zoom",
+            zed_actions::ResetAllZoom { persist: false },
+        ),
         MenuItem::separator(),
         MenuItem::action("Toggle Left Dock", workspace::ToggleLeftDock),
         MenuItem::action("Toggle Right Dock", workspace::ToggleRightDock),
diff --git a/crates/zed_actions/src/lib.rs b/crates/zed_actions/src/lib.rs
index b246ed9c471f22195b1089a4916df77303ddee1f..3fc9903cdc99a8bf5fdb7c14619e3ce963b8fc46 100644
--- a/crates/zed_actions/src/lib.rs
+++ b/crates/zed_actions/src/lib.rs
@@ -154,6 +154,15 @@ pub struct ResetUiFontSize {
     pub persist: bool,
 }
 
+/// Resets all zoom levels (UI and buffer font sizes, including in the agent panel) to their default values.
+#[derive(PartialEq, Clone, Default, Debug, Deserialize, JsonSchema, Action)]
+#[action(namespace = zed)]
+#[serde(deny_unknown_fields)]
+pub struct ResetAllZoom {
+    #[serde(default)]
+    pub persist: bool,
+}
+
 pub mod dev {
     use gpui::actions;
 
@@ -311,6 +320,8 @@ pub mod agent {
             /// Add the current selection as context for threads in the agent panel.
             #[action(deprecated_aliases = ["assistant::QuoteSelection", "agent::QuoteSelection"])]
             AddSelectionToThread,
+            /// Resets the agent panel zoom levels (agent UI and buffer font sizes).
+            ResetAgentZoom,
         ]
     );
 }