diff --git a/apps/client/src/views/timer/Timer.scss b/apps/client/src/views/timer/Timer.scss
index 7e94b7c66..20d0ce531 100644
--- a/apps/client/src/views/timer/Timer.scss
+++ b/apps/client/src/views/timer/Timer.scss
@@ -195,6 +195,25 @@
     font-weight: 600;
   }
 
+  /* =================== SOUND PROMPT ===================*/
+  .sound-prompt {
+    position: absolute;
+    bottom: $view-block-padding;
+    left: $view-inline-padding;
+    padding: 0.5em 0.75em;
+    border-radius: $element-border-radius;
+    background-color: $viewer-card-bg-color;
+    color: $viewer-secondary-color;
+    font-size: $timer-label-size;
+    text-transform: uppercase;
+    pointer-events: none;
+    transition: opacity $viewer-transition-time;
+
+    &--hidden {
+      opacity: 0;
+    }
+  }
+
   /* =================== LOGO ===================*/
   .logo {
     position: absolute;
diff --git a/apps/client/src/views/timer/Timer.tsx b/apps/client/src/views/timer/Timer.tsx
index a3e10c91f..0ec50f704 100644
--- a/apps/client/src/views/timer/Timer.tsx
+++ b/apps/client/src/views/timer/Timer.tsx
@@ -8,6 +8,7 @@ import TitleCard from '../../common/components/title-card/TitleCard';
 import ViewLogo from '../../common/components/view-logo/ViewLogo';
 import ViewParamsEditor from '../../common/components/view-params-editor/ViewParamsEditor';
 import { useAutoTickingClock } from '../../common/hooks/useAutoTickingClock';
+import { useFadeOutOnInactivity } from '../../common/hooks/useFadeOutOnInactivity';
 import { useTimerSocket } from '../../common/hooks/useSocket';
 import { useWindowTitle } from '../../common/hooks/useWindowTitle';
 import { cx } from '../../common/utils/styleUtils';
@@ -30,6 +31,7 @@ import {
   getTotalTime,
 } from './timer.utils';
 import { TimerData, useTimerData } from './useTimerData';
+import { useTimerSound } from './useTimerSound';
 
 import './Timer.scss';
 
@@ -66,6 +68,7 @@ function Timer({ customFields, projectData, isMirrored, settings, viewSettings,
     freezeOvertime,
     freezeMessage,
     hidePhase,
+    endSound,
     font,
     keyColour,
     timerColour,
@@ -75,6 +78,8 @@ function Timer({ customFields, projectData, isMirrored, settings, viewSettings,
   const { getLocalizedString } = useTranslation();
   const localisedMinutes = getLocalizedString('common.minutes');
 
+  const { showPrompt } = useTimerSound(time.phase, endSound);
+
   // gather modifiers
   const viewTimerType = timerType ?? timerTypeNow;
   const showOverlay = getShowMessage(message.timer);
@@ -156,6 +161,8 @@ function Timer({ customFields, projectData, isMirrored, settings, viewSettings,
 
       <ViewParamsEditor target={OntimeView.Timer} viewOptions={timerOptions} />
 
+      {showPrompt && <EnableSoundPrompt />}
+
       <div className={cx(['blackout', message.timer.blackout && 'blackout--active'])} />
 
       {!hideMessage && (
@@ -227,3 +234,19 @@ function TimerAutoTickingClock({ clockFormat }: { clockFormat: MaybeString }) {
     </div>
   );
 }
+
+/**
+ * Nudges the user to interact with the screen so that the browser allows audio playback
+ * Any interaction arms the sound, so this is a hint rather than a control
+ * It is tied to mouse movement since that does not itself grant playback permission,
+ * which keeps the hint off screen unless somebody is at the machine to act on it
+ */
+function EnableSoundPrompt() {
+  const isUserActive = useFadeOutOnInactivity(true);
+
+  return (
+    <div className={cx(['sound-prompt', !isUserActive && 'sound-prompt--hidden'])} aria-live='polite'>
+      Tap the screen to enable sound
+    </div>
+  );
+}
diff --git a/apps/client/src/views/timer/__tests__/timer.utils.test.ts b/apps/client/src/views/timer/__tests__/timer.utils.test.ts
new file mode 100644
index 000000000..78f210751
--- /dev/null
+++ b/apps/client/src/views/timer/__tests__/timer.utils.test.ts
@@ -0,0 +1,34 @@
+import { TimerPhase } from 'ontime-types';
+
+import { shouldPlayEndSound } from '../timer.utils';
+
+describe('shouldPlayEndSound()', () => {
+  test.each([TimerPhase.Default, TimerPhase.Warning, TimerPhase.Danger])(
+    'sounds when a running timer goes into overtime from %s',
+    (previousPhase) => {
+      expect(shouldPlayEndSound(previousPhase, TimerPhase.Overtime)).toBe(true);
+    },
+  );
+
+  it('stays silent on the first phase we see, a client could be joining mid-overtime', () => {
+    expect(shouldPlayEndSound(null, TimerPhase.Overtime)).toBe(false);
+  });
+
+  it('stays silent when the phase was reset, a reload during overtime starts from none', () => {
+    expect(shouldPlayEndSound(TimerPhase.None, TimerPhase.Overtime)).toBe(false);
+  });
+
+  it('stays silent for a roll timer waiting to start', () => {
+    expect(shouldPlayEndSound(TimerPhase.Pending, TimerPhase.Overtime)).toBe(false);
+  });
+
+  it('sounds once, not on every update while in overtime', () => {
+    expect(shouldPlayEndSound(TimerPhase.Overtime, TimerPhase.Overtime)).toBe(false);
+  });
+
+  it('stays silent on phases which are not the end of the timer', () => {
+    expect(shouldPlayEndSound(TimerPhase.Default, TimerPhase.Warning)).toBe(false);
+    expect(shouldPlayEndSound(TimerPhase.Warning, TimerPhase.Danger)).toBe(false);
+    expect(shouldPlayEndSound(TimerPhase.Overtime, TimerPhase.None)).toBe(false);
+  });
+});
diff --git a/apps/client/src/views/timer/timer.options.ts b/apps/client/src/views/timer/timer.options.ts
index ffcd84391..698acccc5 100644
--- a/apps/client/src/views/timer/timer.options.ts
+++ b/apps/client/src/views/timer/timer.options.ts
@@ -76,6 +76,14 @@ export const getTimerOptions = (timeFormat: string, customFields: CustomFields):
           type: 'boolean',
           defaultValue: false,
         },
+        {
+          id: 'endSound',
+          title: 'Play sound on timer end',
+          description:
+            'Plays a sound in this screen when the timer reaches zero. The screen must be interacted with once before it can play',
+          type: 'boolean',
+          defaultValue: false,
+        },
       ],
     },
     {
@@ -193,6 +201,7 @@ type TimerOptions = {
   freezeOvertime: boolean;
   freezeMessage: string;
   hidePhase: boolean;
+  endSound: boolean;
   font?: string;
   keyColour?: string;
   timerColour?: string;
@@ -227,6 +236,7 @@ function getOptionsFromParams(searchParams: URLSearchParams, defaultValues?: URL
     freezeOvertime: isStringBoolean(getValue('freezeOvertime')),
     freezeMessage: getValue('freezeMessage') ?? '',
     hidePhase: isStringBoolean(getValue('hidePhase')),
+    endSound: isStringBoolean(getValue('endSound')),
 
     font: getValue('font') ?? undefined,
     keyColour: makeColourString(getValue('keyColour')),
diff --git a/apps/client/src/views/timer/timer.utils.ts b/apps/client/src/views/timer/timer.utils.ts
index 1add32d88..6537c524a 100644
--- a/apps/client/src/views/timer/timer.utils.ts
+++ b/apps/client/src/views/timer/timer.utils.ts
@@ -189,3 +189,18 @@ export function getCardData(
     nextSecondary,
   };
 }
+
+/**
+ * Whether the end of timer sound should play for a given phase transition
+ * We only sound the transition into overtime from a phase that was already counting,
+ * which keeps a client that connects or reloads mid-overtime silent
+ */
+export function shouldPlayEndSound(previousPhase: TimerPhase | null, phase: TimerPhase): boolean {
+  if (phase !== TimerPhase.Overtime) {
+    return false;
+  }
+
+  return (
+    previousPhase === TimerPhase.Default || previousPhase === TimerPhase.Warning || previousPhase === TimerPhase.Danger
+  );
+}
diff --git a/apps/client/src/views/timer/useTimerSound.ts b/apps/client/src/views/timer/useTimerSound.ts
new file mode 100644
index 000000000..2fcb1b925
--- /dev/null
+++ b/apps/client/src/views/timer/useTimerSound.ts
@@ -0,0 +1,77 @@
+import { TimerPhase } from 'ontime-types';
+import { useEffect, useRef, useState } from 'react';
+
+import buzzer from '../../assets/sounds/buzzer.mp3';
+import { shouldPlayEndSound } from './timer.utils';
+
+/**
+ * Plays a sound when the timer reaches its end
+ *
+ * Browsers reject playback until the document has been interacted with, and that permission
+ * is lost on every page load. Since a timer screen is typically left unattended, we prime the
+ * audio element on the first interaction and let the view prompt for one if it never comes.
+ * Safari grants the permission per element, so priming has to call play() on this element from
+ * inside the event handler, it is not enough to know that an interaction happened.
+ */
+export function useTimerSound(phase: TimerPhase, enabled: boolean): { showPrompt: boolean } {
+  const audioRef = useRef<HTMLAudioElement | null>(null);
+  const previousPhaseRef = useRef<TimerPhase | null>(null);
+  const [isArmed, setIsArmed] = useState(false);
+
+  useEffect(() => {
+    if (!enabled) {
+      return;
+    }
+
+    audioRef.current = new Audio(buzzer);
+
+    return () => {
+      audioRef.current?.pause();
+      audioRef.current = null;
+      setIsArmed(false);
+    };
+  }, [enabled]);
+
+  useEffect(() => {
+    if (!enabled || isArmed) {
+      return;
+    }
+
+    const controller = new AbortController();
+    const prime = () => {
+      audioRef.current
+        ?.play()
+        .then(() => {
+          if (!audioRef.current) return;
+          audioRef.current.pause();
+          audioRef.current.currentTime = 0;
+          setIsArmed(true);
+        })
+        .catch(() => {
+          // playback is still blocked, a later interaction will try again
+        });
+    };
+
+    document.addEventListener('pointerdown', prime, { capture: true, signal: controller.signal });
+    document.addEventListener('keydown', prime, { capture: true, signal: controller.signal });
+
+    return () => {
+      controller.abort();
+    };
+  }, [enabled, isArmed]);
+
+  useEffect(() => {
+    const previousPhase = previousPhaseRef.current;
+    previousPhaseRef.current = phase;
+
+    if (!enabled || !shouldPlayEndSound(previousPhase, phase)) {
+      return;
+    }
+
+    audioRef.current?.play().catch(() => {
+      // the screen has not been interacted with, the view shows a prompt for it
+    });
+  }, [enabled, phase]);
+
+  return { showPrompt: enabled && !isArmed };
+}