diff --git a/package.json b/package.json
index 0e1909f3e3..7be54d235a 100644
--- a/package.json
+++ b/package.json
@@ -82,6 +82,7 @@
     "matrix-js-sdk": "github:matrix-org/matrix-js-sdk#develop",
     "minimist": "^1.2.0",
     "pako": "^1.0.5",
+    "parse5": "^5.1.1",
     "png-chunks-extract": "^1.0.0",
     "project-name-generator": "^2.1.7",
     "prop-types": "^15.5.8",
diff --git a/src/SlashCommands.tsx b/src/SlashCommands.tsx
index 5e8c1087f7..d061dbed60 100644
--- a/src/SlashCommands.tsx
+++ b/src/SlashCommands.tsx
@@ -36,6 +36,8 @@ import { getDefaultIdentityServerUrl, useDefaultIdentityServer } from './utils/I
 import {isPermalinkHost, parsePermalink} from "./utils/permalinks/Permalinks";
 import {inviteUsersToRoom} from "./RoomInvite";
 import { WidgetType } from "./widgets/WidgetType";
+import { Jitsi } from "./widgets/Jitsi";
+import { parseFragment as parseHtml } from "parse5";
 import sendBugReport from "./rageshake/submit-rageshake";
 import SdkConfig from "./SdkConfig";
 
@@ -769,18 +771,50 @@ export const Commands = [
     }),
     new Command({
         command: 'addwidget',
-        args: '<url>',
+        args: '<url | embed code | Jitsi url>',
         description: _td('Adds a custom widget by URL to the room'),
-        runFn: function(roomId, args) {
-            if (!args || (!args.startsWith("https://") && !args.startsWith("http://"))) {
+        runFn: function(roomId, widgetUrl) {
+            if (!widgetUrl) {
+                return reject(_t("Please supply a widget URL or embed code"));
+            }
+
+            // Try and parse out a widget URL from iframes
+            if (widgetUrl.toLowerCase().startsWith("<iframe ")) {
+                // We use parse5, which doesn't render/create a DOM node. It instead runs
+                // some superfast regex over the text so we don't have to.
+                const embed = parseHtml(widgetUrl);
+                if (embed && embed.childNodes && embed.childNodes.length === 1) {
+                    const iframe = embed.childNodes[0];
+                    if (iframe.tagName.toLowerCase() === 'iframe' && iframe.attrs) {
+                        const srcAttr = iframe.attrs.find(a => a.name === 'src');
+                        console.log("Pulling URL out of iframe (embed code)");
+                        widgetUrl = srcAttr.value;
+                    }
+                }
+            }
+
+            if (!widgetUrl.startsWith("https://") && !widgetUrl.startsWith("http://")) {
                 return reject(_t("Please supply a https:// or http:// widget URL"));
             }
             if (WidgetUtils.canUserModifyWidgets(roomId)) {
                 const userId = MatrixClientPeg.get().getUserId();
                 const nowMs = (new Date()).getTime();
                 const widgetId = encodeURIComponent(`${roomId}_${userId}_${nowMs}`);
-                return success(WidgetUtils.setRoomWidget(
-                    roomId, widgetId, WidgetType.CUSTOM, args, "Custom Widget", {}));
+                let type = WidgetType.CUSTOM;
+                let name = "Custom Widget";
+                let data = {};
+
+                // Make the widget a Jitsi widget if it looks like a Jitsi widget
+                const jitsiData = Jitsi.getInstance().parsePreferredConferenceUrl(widgetUrl);
+                if (jitsiData) {
+                    console.log("Making /addwidget widget a Jitsi conference");
+                    type = WidgetType.JITSI;
+                    name = "Jitsi Conference";
+                    data = jitsiData;
+                    widgetUrl = WidgetUtils.getLocalJitsiWrapperUrl();
+                }
+
+                return success(WidgetUtils.setRoomWidget(roomId, widgetId, type, widgetUrl, name, data));
             } else {
                 return reject(_t("You cannot modify widgets in this room."));
             }
diff --git a/src/i18n/strings/en_EN.json b/src/i18n/strings/en_EN.json
index dceaf563ec..7af45003a8 100644
--- a/src/i18n/strings/en_EN.json
+++ b/src/i18n/strings/en_EN.json
@@ -202,6 +202,7 @@
     "Deops user with given id": "Deops user with given id",
     "Opens the Developer Tools dialog": "Opens the Developer Tools dialog",
     "Adds a custom widget by URL to the room": "Adds a custom widget by URL to the room",
+    "Please supply a widget URL or embed code": "Please supply a widget URL or embed code",
     "Please supply a https:// or http:// widget URL": "Please supply a https:// or http:// widget URL",
     "You cannot modify widgets in this room.": "You cannot modify widgets in this room.",
     "Verifies a user, session, and pubkey tuple": "Verifies a user, session, and pubkey tuple",
diff --git a/src/widgets/Jitsi.ts b/src/widgets/Jitsi.ts
index 988131e045..15df4953aa 100644
--- a/src/widgets/Jitsi.ts
+++ b/src/widgets/Jitsi.ts
@@ -21,6 +21,12 @@ import {AutoDiscovery} from "matrix-js-sdk/src/autodiscovery";
 const JITSI_WK_PROPERTY = "im.vector.riot.jitsi";
 const JITSI_WK_CHECK_INTERVAL = 2 * 60 * 60 * 1000; // 2 hours, arbitrarily selected
 
+export interface JitsiWidgetData {
+    conferenceId: string;
+    isAudioOnly: boolean;
+    domain: string;
+}
+
 export class Jitsi {
     private static instance: Jitsi;
 
@@ -64,6 +70,22 @@ export class Jitsi {
         console.log("Jitsi conference domain:", this.preferredDomain);
     }
 
+    /**
+     * Parses the given URL into the data needed for a Jitsi widget, if the widget
+     * URL matches the preferredDomain for the app.
+     * @param {string} url The URL to parse.
+     * @returns {JitsiWidgetData} The widget data if eligible, otherwise null.
+     */
+    public parsePreferredConferenceUrl(url: string): JitsiWidgetData {
+        const parsed = new URL(url);
+        if (parsed.hostname !== this.preferredDomain) return null; // invalid
+        return {
+            conferenceId: parsed.pathname,
+            domain: parsed.hostname,
+            isAudioOnly: false,
+        };
+    }
+
     public static getInstance(): Jitsi {
         if (!Jitsi.instance) {
             Jitsi.instance = new Jitsi();
diff --git a/yarn.lock b/yarn.lock
index c601e37340..d92da5a76f 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6434,6 +6434,11 @@ parse5@^3.0.1:
   dependencies:
     "@types/node" "*"
 
+parse5@^5.1.1:
+  version "5.1.1"
+  resolved "https://registry.yarnpkg.com/parse5/-/parse5-5.1.1.tgz#f68e4e5ba1852ac2cadc00f4555fff6c2abb6178"
+  integrity sha512-ugq4DFI0Ptb+WWjAdOK16+u/nHfiIrcE+sh8kZMaM0WllQKLI9rOUq6c2b7cwPkXdzfQESqvoqK6ug7U/Yyzug==
+
 pascalcase@^0.1.1:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/pascalcase/-/pascalcase-0.1.1.tgz#b363e55e8006ca6fe21784d2db22bd15d7917f14"