diff --git a/src/components/party/Party.js b/src/components/party/Party.js
index 1caeb36..3578dd5 100644
--- a/src/components/party/Party.js
+++ b/src/components/party/Party.js
@@ -17,8 +17,10 @@ function Party({
   partyStreams,
   onStreamStart,
   onStreamEnd,
+  timer,
+  partyTimers,
   onTimerStart,
-  onTimerEnd,
+  onTimerStop,
 }) {
   return (
     <Flex
@@ -64,7 +66,11 @@ function Party({
           onStreamEnd={onStreamEnd}
           stream={stream}
         />
-        <StartTimerButton />
+        <StartTimerButton
+          onTimerStart={onTimerStart}
+          onTimerStop={onTimerStop}
+          timer={timer}
+        />
         <SettingsButton />
       </Flex>
     </Flex>
diff --git a/src/components/party/StartTimerButton.js b/src/components/party/StartTimerButton.js
index 2782647..266ba6f 100644
--- a/src/components/party/StartTimerButton.js
+++ b/src/components/party/StartTimerButton.js
@@ -4,7 +4,7 @@ import { IconButton } from "theme-ui";
 import StartTimerModal from "../../modals/StartTimerModal";
 import StartTimerIcon from "../../icons/StartTimerIcon";
 
-function StartTimerButton() {
+function StartTimerButton({ onTimerStart, onTimerStop, timer }) {
   const [isTimerModalOpen, setIsTimerModalOpen] = useState(false);
 
   function openModal() {
@@ -24,7 +24,13 @@ function StartTimerButton() {
       >
         <StartTimerIcon />
       </IconButton>
-      <StartTimerModal isOpen={isTimerModalOpen} onRequestClose={closeModal} />
+      <StartTimerModal
+        isOpen={isTimerModalOpen}
+        onRequestClose={closeModal}
+        onTimerStart={onTimerStart}
+        onTimerStop={onTimerStop}
+        timer={timer}
+      />
     </>
   );
 }
diff --git a/src/modals/StartTimerModal.js b/src/modals/StartTimerModal.js
index 1af6c55..ddfd7e5 100644
--- a/src/modals/StartTimerModal.js
+++ b/src/modals/StartTimerModal.js
@@ -3,7 +3,13 @@ import { Box, Label, Input, Button, Flex, Text } from "theme-ui";
 
 import Modal from "../components/Modal";
 
-function StartTimerModal({ isOpen, onRequestClose }) {
+function StartTimerModal({
+  isOpen,
+  onRequestClose,
+  onTimerStart,
+  onTimerStop,
+  timer,
+}) {
   const inputRef = useRef();
   function focusInput() {
     inputRef.current && inputRef.current.focus();
@@ -15,6 +21,11 @@ function StartTimerModal({ isOpen, onRequestClose }) {
 
   function handleSubmit(event) {
     event.preventDefault();
+    if (timer) {
+      onTimerStop();
+    } else {
+      onTimerStart({ hour, minute, second });
+    }
   }
 
   const inputStyle = {
@@ -59,9 +70,10 @@ function StartTimerModal({ isOpen, onRequestClose }) {
             </Text>
             <Input
               sx={inputStyle}
-              value={`${hour}`}
+              value={`${timer ? timer.hour : hour}`}
               onChange={(e) => setHour(parseValue(e.target.value, 24))}
               type="number"
+              disabled={timer}
               min={0}
               max={24}
             />
@@ -70,10 +82,11 @@ function StartTimerModal({ isOpen, onRequestClose }) {
             </Text>
             <Input
               sx={inputStyle}
-              value={`${minute}`}
+              value={`${timer ? timer.minute : minute}`}
               onChange={(e) => setMinute(parseValue(e.target.value, 59))}
               type="number"
               ref={inputRef}
+              disabled={timer}
               min={0}
               max={59}
             />
@@ -82,9 +95,10 @@ function StartTimerModal({ isOpen, onRequestClose }) {
             </Text>
             <Input
               sx={inputStyle}
-              value={`${second}`}
+              value={`${timer ? timer.second : second}`}
               onChange={(e) => setSecond(parseValue(e.target.value, 59))}
               type="number"
+              disabled={timer}
               min={0}
               max={59}
             />
@@ -94,7 +108,7 @@ function StartTimerModal({ isOpen, onRequestClose }) {
               sx={{ flexGrow: 1 }}
               disabled={hour === 0 && minute === 0 && second === 0}
             >
-              Start Timer
+              {timer ? "Stop Timer" : "Start Timer"}
             </Button>
           </Flex>
         </Box>
diff --git a/src/network/NetworkedParty.js b/src/network/NetworkedParty.js
index 68bd59a..0152160 100644
--- a/src/network/NetworkedParty.js
+++ b/src/network/NetworkedParty.js
@@ -23,10 +23,12 @@ function NetworkedParty({ gameId, session }) {
   const [partyNicknames, setPartyNicknames] = useState({});
   const [stream, setStream] = useState(null);
   const [partyStreams, setPartyStreams] = useState({});
+  const [timer, setTimer] = useState(null);
+  const [partyTimers, setPartyTimers] = useState({});
 
-  function handleNicknameChange(nickname) {
-    setNickname(nickname);
-    session.send("nickname", { [session.id]: nickname });
+  function handleNicknameChange(newNickname) {
+    setNickname(newNickname);
+    session.send("nickname", { [session.id]: newNickname });
   }
 
   function handleStreamStart(localStream) {
@@ -59,16 +61,57 @@ function NetworkedParty({ gameId, session }) {
     [session]
   );
 
+  function handleTimerStart(newTimer) {
+    setTimer(newTimer);
+    session.send("timer", { [session.id]: newTimer });
+  }
+
+  function handleTimerStop() {
+    setTimer(null);
+    session.send("timer", { [session.id]: null });
+  }
+
+  useEffect(() => {
+    function decreaseTimer(previousTimer) {
+      if (previousTimer.second > 0) {
+        return { ...previousTimer, second: previousTimer.second - 1 };
+      } else if (previousTimer.minute > 0) {
+        return {
+          ...previousTimer,
+          minute: previousTimer.minute - 1,
+          second: 59,
+        };
+      } else if (previousTimer.hour > 0) {
+        return { hour: previousTimer.hour - 1, minute: 59, second: 59 };
+      } else return { hour: 0, minute: 0, second: 0 };
+    }
+    function updateTimers() {
+      if (timer) {
+        const newTimer = decreaseTimer(timer);
+        setTimer(newTimer);
+        session.send("timer", { [session.id]: newTimer });
+      }
+    }
+    const interval = setInterval(updateTimers, 1000);
+    return () => {
+      clearInterval(interval);
+    };
+  }, [timer, session]);
+
   useEffect(() => {
     function handlePeerConnect({ peer, reply }) {
       reply("nickname", { [session.id]: nickname });
       if (stream) {
         peer.connection.addStream(stream);
       }
+      if (timer) {
+        reply("timer", { [session.id]: timer });
+      }
     }
 
     function handlePeerDisconnect({ peer }) {
       setPartyNicknames((prevNicknames) => omit(prevNicknames, [peer.id]));
+      setPartyTimers((prevTimers) => omit(prevTimers, [peer.id]));
     }
 
     function handlePeerData({ id, data }) {
@@ -78,6 +121,12 @@ function NetworkedParty({ gameId, session }) {
           ...data,
         }));
       }
+      if (id === "timer") {
+        setPartyTimers((prevTimers) => ({
+          ...prevTimers,
+          ...data,
+        }));
+      }
     }
 
     function handlePeerTrackAdded({ peer, stream: remoteStream }) {
@@ -111,7 +160,7 @@ function NetworkedParty({ gameId, session }) {
       session.off("trackAdded", handlePeerTrackAdded);
       session.off("trackRemoved", handlePeerTrackRemoved);
     };
-  }, [session, nickname, stream]);
+  }, [session, nickname, stream, timer]);
 
   useEffect(() => {
     if (stream) {
@@ -139,6 +188,10 @@ function NetworkedParty({ gameId, session }) {
       partyNicknames={partyNicknames}
       stream={stream}
       partyStreams={partyStreams}
+      timer={timer}
+      partyTimers={partyTimers}
+      onTimerStart={handleTimerStart}
+      onTimerStop={handleTimerStop}
     />
   );
 }