diff --git a/src/main/codex-accounts/runtime-home-service.test.ts b/src/main/codex-accounts/runtime-home-service.test.ts
index 8399055b7..9bb7f354f 100644
--- a/src/main/codex-accounts/runtime-home-service.test.ts
+++ b/src/main/codex-accounts/runtime-home-service.test.ts
@@ -30,6 +30,7 @@ vi.mock('node:os', async () => {
 })
 
 function createSettings(overrides: Partial<GlobalSettings> = {}): GlobalSettings {
+  const appFontFamily = overrides.appFontFamily ?? 'Geist'
   return {
     workspaceDir: testState.fakeHomeDir,
     nestWorkspaces: false,
@@ -100,7 +101,8 @@ function createSettings(overrides: Partial<GlobalSettings> = {}): GlobalSettings
     terminalWindowsShell: 'powershell.exe',
     terminalWindowsPowerShellImplementation: 'powershell.exe',
     enableGitHubAttribution: true,
-    ...overrides
+    ...overrides,
+    appFontFamily
   }
 }
 
diff --git a/src/main/codex-accounts/service.test.ts b/src/main/codex-accounts/service.test.ts
index 51de5333e..2ef8ccba9 100644
--- a/src/main/codex-accounts/service.test.ts
+++ b/src/main/codex-accounts/service.test.ts
@@ -24,6 +24,7 @@ vi.mock('node:os', async () => {
 })
 
 function createSettings(overrides: Partial<GlobalSettings> = {}): GlobalSettings {
+  const appFontFamily = overrides.appFontFamily ?? 'Geist'
   return {
     workspaceDir: testState.fakeHomeDir,
     nestWorkspaces: false,
@@ -94,7 +95,8 @@ function createSettings(overrides: Partial<GlobalSettings> = {}): GlobalSettings
     terminalWindowsShell: 'powershell.exe',
     terminalWindowsPowerShellImplementation: 'powershell.exe',
     enableGitHubAttribution: true,
-    ...overrides
+    ...overrides,
+    appFontFamily
   }
 }
 
diff --git a/src/main/persistence.test.ts b/src/main/persistence.test.ts
index c810e9977..2bed14f0a 100644
--- a/src/main/persistence.test.ts
+++ b/src/main/persistence.test.ts
@@ -72,6 +72,7 @@ describe('Store', () => {
     expect(settings.branchPrefix).toBe('git-username')
     expect(settings.refreshLocalBaseRefOnWorktreeCreate).toBe(false)
     expect(settings.theme).toBe('system')
+    expect(settings.appFontFamily).toBe('Geist')
     expect(settings.editorAutoSave).toBe(false)
     expect(settings.editorAutoSaveDelayMs).toBe(1000)
     expect(settings.terminalFontSize).toBe(14)
@@ -310,12 +311,14 @@ describe('Store', () => {
       theme: 'dark',
       editorAutoSave: true,
       editorAutoSaveDelayMs: 1500,
+      appFontFamily: 'Inter',
       terminalFontSize: 16,
       terminalFontWeight: 600
     })
     expect(updated.theme).toBe('dark')
     expect(updated.editorAutoSave).toBe(true)
     expect(updated.editorAutoSaveDelayMs).toBe(1500)
+    expect(updated.appFontFamily).toBe('Inter')
     expect(updated.terminalFontSize).toBe(16)
     expect(updated.terminalFontWeight).toBe(600)
     // Other fields preserved
diff --git a/src/renderer/src/App.tsx b/src/renderer/src/App.tsx
index 62fca2a1c..0d68326a5 100644
--- a/src/renderer/src/App.tsx
+++ b/src/renderer/src/App.tsx
@@ -9,6 +9,7 @@ import {
   TOGGLE_TERMINAL_PANE_EXPAND_EVENT
 } from '@/constants/terminal'
 import { syncZoomCSSVar } from '@/lib/ui-zoom'
+import { buildAppFontFamily } from '@/lib/app-font-family'
 import { toast } from 'sonner'
 import { Toaster } from '@/components/ui/sonner'
 import { Tooltip, TooltipContent, TooltipProvider, TooltipTrigger } from '@/components/ui/tooltip'
@@ -518,6 +519,13 @@ function App(): React.JSX.Element {
     }
   }, [settings])
 
+  useEffect(() => {
+    document.documentElement.style.setProperty(
+      '--app-font-family',
+      buildAppFontFamily(settings?.appFontFamily)
+    )
+  }, [settings?.appFontFamily])
+
   // Refresh GitHub data (PR/issue status) when window regains focus
   useEffect(() => {
     const handler = (): void => {
diff --git a/src/renderer/src/assets/main.css b/src/renderer/src/assets/main.css
index 964d39195..f986c18c9 100644
--- a/src/renderer/src/assets/main.css
+++ b/src/renderer/src/assets/main.css
@@ -61,6 +61,8 @@
 /* ── Light Mode ──────────────────────────────────────── */
 
 :root {
+  --app-font-family: 'Geist', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
+  --font-sans: var(--app-font-family);
   --font-mono:
     'SF Mono', SFMono-Regular, ui-monospace, 'Cascadia Code', Menlo, Consolas, 'Liberation Mono',
     monospace;
@@ -165,12 +167,14 @@
     padding: 0;
     overflow: hidden;
     height: 100vh;
-    font-family:
+    font-family: var(
+      --app-font-family,
       'Geist',
       -apple-system,
       BlinkMacSystemFont,
       'Segoe UI',
-      sans-serif;
+      sans-serif
+    );
     letter-spacing: 0.01em;
     -webkit-font-smoothing: antialiased;
     -moz-osx-font-smoothing: grayscale;
diff --git a/src/renderer/src/components/settings/AppearancePane.tsx b/src/renderer/src/components/settings/AppearancePane.tsx
index 4642d5508..290abf983 100644
--- a/src/renderer/src/components/settings/AppearancePane.tsx
+++ b/src/renderer/src/components/settings/AppearancePane.tsx
@@ -5,11 +5,14 @@ import { UIZoomControl } from './UIZoomControl'
 import { SearchableSetting } from './SearchableSetting'
 import { matchesSettingsSearch, type SettingsSearchEntry } from './settings-search'
 import { useAppStore } from '../../store'
+import { FontAutocomplete } from './SettingsFormControls'
+import { DEFAULT_APP_FONT_FAMILY } from '../../../../shared/constants'
 
 type AppearancePaneProps = {
   settings: GlobalSettings
   updateSettings: (updates: Partial<GlobalSettings>) => void
   applyTheme: (theme: 'system' | 'dark' | 'light') => void
+  fontSuggestions: string[]
 }
 
 const STATUS_BAR_TOGGLES: readonly {
@@ -87,6 +90,14 @@ const ZOOM_ENTRIES: SettingsSearchEntry[] = [
   }
 ]
 
+const TYPOGRAPHY_ENTRIES: SettingsSearchEntry[] = [
+  {
+    title: 'IDE Font',
+    description: 'Choose the font used by the Orca interface.',
+    keywords: ['font', 'typeface', 'typography', 'ide', 'orca', 'interface', 'app', 'ui']
+  }
+]
+
 const LAYOUT_ENTRIES: SettingsSearchEntry[] = [
   {
     title: 'Open Right Sidebar by Default',
@@ -117,6 +128,7 @@ const SIDEBAR_ENTRIES: SettingsSearchEntry[] = [
 
 export const APPEARANCE_PANE_SEARCH_ENTRIES: SettingsSearchEntry[] = [
   ...THEME_ENTRIES,
+  ...TYPOGRAPHY_ENTRIES,
   ...ZOOM_ENTRIES,
   ...LAYOUT_ENTRIES,
   ...TITLEBAR_ENTRIES,
@@ -127,7 +139,8 @@ export const APPEARANCE_PANE_SEARCH_ENTRIES: SettingsSearchEntry[] = [
 export function AppearancePane({
   settings,
   updateSettings,
-  applyTheme
+  applyTheme,
+  fontSuggestions
 }: AppearancePaneProps): React.JSX.Element {
   const searchQuery = useAppStore((state) => state.settingsSearchQuery)
   const isMac = navigator.userAgent.includes('Mac')
@@ -191,6 +204,33 @@ export function AppearancePane({
         </SearchableSetting>
       </section>
     ) : null,
+    matchesSettingsSearch(searchQuery, TYPOGRAPHY_ENTRIES) ? (
+      <section key="typography" className="space-y-4">
+        <div className="space-y-1">
+          <h3 className="text-sm font-semibold">Typography</h3>
+          <p className="text-xs text-muted-foreground">
+            Choose the font used by the Orca interface.
+          </p>
+        </div>
+
+        <SearchableSetting
+          title="IDE Font"
+          description="Choose the font used by the Orca interface."
+          keywords={['font', 'typeface', 'typography', 'ide', 'orca', 'interface', 'app', 'ui']}
+          className="space-y-2"
+        >
+          <Label>IDE Font</Label>
+          <FontAutocomplete
+            value={settings.appFontFamily}
+            suggestions={fontSuggestions}
+            placeholder={DEFAULT_APP_FONT_FAMILY}
+            onChange={(value) =>
+              updateSettings({ appFontFamily: value.trim() || DEFAULT_APP_FONT_FAMILY })
+            }
+          />
+        </SearchableSetting>
+      </section>
+    ) : null,
     matchesSettingsSearch(searchQuery, LAYOUT_ENTRIES) ? (
       <section key="layout" className="space-y-4">
         <div className="space-y-1">
diff --git a/src/renderer/src/components/settings/Settings.tsx b/src/renderer/src/components/settings/Settings.tsx
index 1611c4f4d..429132be9 100644
--- a/src/renderer/src/components/settings/Settings.tsx
+++ b/src/renderer/src/components/settings/Settings.tsx
@@ -23,6 +23,7 @@ import { useAppStore } from '../../store'
 import { useSystemPrefersDark } from '@/components/terminal-pane/use-system-prefers-dark'
 import { isMacUserAgent, isWindowsUserAgent } from '@/components/terminal-pane/pane-helpers'
 import { SCROLLBACK_PRESETS_MB, getFallbackTerminalFonts } from './SettingsConstants'
+import { DEFAULT_APP_FONT_FAMILY } from '../../../../shared/constants'
 import { GeneralPane, GENERAL_PANE_SEARCH_ENTRIES } from './GeneralPane'
 import { BrowserPane, BROWSER_PANE_SEARCH_ENTRIES } from './BrowserPane'
 import { AppearancePane, APPEARANCE_PANE_SEARCH_ENTRIES } from './AppearancePane'
@@ -180,8 +181,8 @@ function Settings(): React.JSX.Element {
     void window.api.wsl.isAvailable().then(setWslAvailable)
     void window.api.pwsh.isAvailable().then(setPwshAvailable)
   }, [isWindows])
-  const [terminalFontSuggestions, setTerminalFontSuggestions] = useState<string[]>(
-    getFallbackTerminalFonts()
+  const [fontSuggestions, setFontSuggestions] = useState<string[]>(
+    Array.from(new Set([DEFAULT_APP_FONT_FAMILY, ...getFallbackTerminalFonts()]))
   )
   const [activeSectionId, setActiveSectionId] = useState('general')
   // Why: the hidden-experimental group is an unlock — Shift-clicking the
@@ -255,7 +256,9 @@ function Settings(): React.JSX.Element {
           return
         }
         terminalFontsLoadedRef.current = true
-        setTerminalFontSuggestions((prev) => Array.from(new Set([...fonts, ...prev])).slice(0, 320))
+        setFontSuggestions((prev) =>
+          Array.from(new Set([DEFAULT_APP_FONT_FAMILY, ...fonts, ...prev])).slice(0, 320)
+        )
       } catch {
         // Fall back to curated cross-platform suggestions.
       }
@@ -684,6 +687,7 @@ function Settings(): React.JSX.Element {
                     settings={settings}
                     updateSettings={updateSettings}
                     applyTheme={applyTheme}
+                    fontSuggestions={fontSuggestions}
                   />
                 </SettingsSection>
 
@@ -708,7 +712,7 @@ function Settings(): React.JSX.Element {
                     settings={settings}
                     updateSettings={updateSettings}
                     systemPrefersDark={systemPrefersDark}
-                    terminalFontSuggestions={terminalFontSuggestions}
+                    terminalFontSuggestions={fontSuggestions}
                     scrollbackMode={scrollbackMode}
                     setScrollbackMode={setScrollbackMode}
                     ghostty={ghostty}
diff --git a/src/renderer/src/components/settings/SettingsFormControls.tsx b/src/renderer/src/components/settings/SettingsFormControls.tsx
index b1ad300f1..737b5cb4e 100644
--- a/src/renderer/src/components/settings/SettingsFormControls.tsx
+++ b/src/renderer/src/components/settings/SettingsFormControls.tsx
@@ -42,6 +42,7 @@ type FontAutocompleteProps = {
   value: string
   suggestions: string[]
   onChange: (value: string) => void
+  placeholder?: string
 }
 
 export function ThemePicker({
@@ -214,7 +215,8 @@ export function NumberField({
 export function FontAutocomplete({
   value,
   suggestions,
-  onChange
+  onChange,
+  placeholder = 'SF Mono'
 }: FontAutocompleteProps): React.JSX.Element {
   const [query, setQuery] = useState(value)
   const [prevValue, setPrevValue] = useState(value)
@@ -353,7 +355,7 @@ export function FontAutocomplete({
               }
             }
           }}
-          placeholder="SF Mono"
+          placeholder={placeholder}
           className="pr-18"
           role="combobox"
           aria-autocomplete="list"
diff --git a/src/renderer/src/lib/app-font-family.test.ts b/src/renderer/src/lib/app-font-family.test.ts
new file mode 100644
index 000000000..3a23f8992
--- /dev/null
+++ b/src/renderer/src/lib/app-font-family.test.ts
@@ -0,0 +1,22 @@
+import { describe, expect, it } from 'vitest'
+import { buildAppFontFamily } from './app-font-family'
+
+describe('buildAppFontFamily', () => {
+  it('defaults to the bundled app font', () => {
+    expect(buildAppFontFamily('')).toBe(
+      '"Geist", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif'
+    )
+  })
+
+  it('places a custom UI font before the fallback chain', () => {
+    expect(buildAppFontFamily('Inter')).toBe(
+      '"Inter", "Geist", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif'
+    )
+  })
+
+  it('does not duplicate the bundled font when selected explicitly', () => {
+    expect(buildAppFontFamily('Geist')).toBe(
+      '"Geist", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif'
+    )
+  })
+})
diff --git a/src/renderer/src/lib/app-font-family.ts b/src/renderer/src/lib/app-font-family.ts
new file mode 100644
index 000000000..956f478e0
--- /dev/null
+++ b/src/renderer/src/lib/app-font-family.ts
@@ -0,0 +1,36 @@
+import { DEFAULT_APP_FONT_FAMILY } from '../../../shared/constants'
+
+const APP_FONT_FALLBACKS = [
+  DEFAULT_APP_FONT_FAMILY,
+  '-apple-system',
+  'BlinkMacSystemFont',
+  'Segoe UI',
+  'sans-serif'
+] as const
+
+const CSS_FONT_KEYWORDS = new Set([
+  'serif',
+  'sans-serif',
+  'monospace',
+  'cursive',
+  'fantasy',
+  'system-ui',
+  'blinkmacsystemfont'
+])
+
+function quoteFontFamily(fontFamily: string): string {
+  if (fontFamily.startsWith('-') || CSS_FONT_KEYWORDS.has(fontFamily.toLowerCase())) {
+    return fontFamily
+  }
+  return JSON.stringify(fontFamily)
+}
+
+export function buildAppFontFamily(fontFamily: string | null | undefined): string {
+  const trimmed = fontFamily?.trim() || DEFAULT_APP_FONT_FAMILY
+  const lowerTrimmed = trimmed.toLowerCase()
+  const parts = [
+    trimmed,
+    ...APP_FONT_FALLBACKS.filter((fallback) => fallback.toLowerCase() !== lowerTrimmed)
+  ]
+  return parts.map(quoteFontFamily).join(', ')
+}
diff --git a/src/shared/constants.ts b/src/shared/constants.ts
index 2d59a9e18..879ab9c3d 100644
--- a/src/shared/constants.ts
+++ b/src/shared/constants.ts
@@ -11,6 +11,7 @@ import type {
 import { DEFAULT_TERMINAL_FONT_WEIGHT } from './terminal-fonts'
 
 export const SCHEMA_VERSION = 1
+export const DEFAULT_APP_FONT_FAMILY = 'Geist'
 
 export const ORCA_BROWSER_PARTITION = 'persist:orca-browser'
 // Why: blank browser tabs must start from an inert guest URL that does not
@@ -119,6 +120,7 @@ export function getDefaultSettings(homedir: string): GlobalSettings {
     branchPrefixCustom: '',
     enableGitHubAttribution: false,
     theme: 'system',
+    appFontFamily: DEFAULT_APP_FONT_FAMILY,
     editorAutoSave: false,
     editorAutoSaveDelayMs: DEFAULT_EDITOR_AUTO_SAVE_DELAY_MS,
     editorMinimapEnabled: false,
diff --git a/src/shared/types.ts b/src/shared/types.ts
index 061b2c9d4..3e236ff65 100644
--- a/src/shared/types.ts
+++ b/src/shared/types.ts
@@ -1020,6 +1020,7 @@ export type GlobalSettings = {
   branchPrefixCustom: string
   enableGitHubAttribution: boolean
   theme: 'system' | 'dark' | 'light'
+  appFontFamily: string
   editorAutoSave: boolean
   editorAutoSaveDelayMs: number
   editorMinimapEnabled: boolean