diff --git a/Userland/Libraries/LibWeb/HTML/Navigator.cpp b/Userland/Libraries/LibWeb/HTML/Navigator.cpp
index 9c0f2d15630..dba3531ef4b 100644
--- a/Userland/Libraries/LibWeb/HTML/Navigator.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Navigator.cpp
@@ -1,6 +1,7 @@
 /*
  * Copyright (c) 2022, Andrew Kaster <akaster@serenityos.org>
  * Copyright (c) 2022, Linus Groh <linusg@serenityos.org>
+ * Copyright (c) 2024, Jamie Mansfield <jmansfield@cadixdev.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
@@ -66,6 +67,7 @@ void Navigator::visit_edges(Cell::Visitor& visitor)
     visitor.visit(m_clipboard);
     visitor.visit(m_user_activation);
     visitor.visit(m_service_worker_container);
+    visitor.visit(m_media_capabilities);
 }
 
 JS::NonnullGCPtr<MimeTypeArray> Navigator::mime_types()
@@ -122,4 +124,11 @@ JS::NonnullGCPtr<ServiceWorkerContainer> Navigator::service_worker()
     return *m_service_worker_container;
 }
 
+JS::NonnullGCPtr<MediaCapabilitiesAPI::MediaCapabilities> Navigator::media_capabilities()
+{
+    if (!m_media_capabilities)
+        m_media_capabilities = heap().allocate<MediaCapabilitiesAPI::MediaCapabilities>(realm(), realm());
+    return *m_media_capabilities;
+}
+
 }
diff --git a/Userland/Libraries/LibWeb/HTML/Navigator.h b/Userland/Libraries/LibWeb/HTML/Navigator.h
index de5703ba2cb..e48061e096f 100644
--- a/Userland/Libraries/LibWeb/HTML/Navigator.h
+++ b/Userland/Libraries/LibWeb/HTML/Navigator.h
@@ -15,6 +15,7 @@
 #include <LibWeb/HTML/NavigatorOnLine.h>
 #include <LibWeb/HTML/PluginArray.h>
 #include <LibWeb/HTML/UserActivation.h>
+#include <LibWeb/MediaCapabilitiesAPI/MediaCapabilities.h>
 #include <LibWeb/StorageAPI/NavigatorStorage.h>
 
 namespace Web::HTML {
@@ -56,6 +57,8 @@ public:
 
     JS::NonnullGCPtr<ServiceWorkerContainer> service_worker();
 
+    JS::NonnullGCPtr<MediaCapabilitiesAPI::MediaCapabilities> media_capabilities();
+
     static WebIDL::Long max_touch_points();
 
     virtual ~Navigator() override;
@@ -82,6 +85,9 @@ private:
 
     // https://w3c.github.io/ServiceWorker/#navigator-serviceworker
     JS::GCPtr<ServiceWorkerContainer> m_service_worker_container;
+
+    // https://w3c.github.io/media-capabilities/#dom-navigator-mediacapabilities
+    JS::GCPtr<MediaCapabilitiesAPI::MediaCapabilities> m_media_capabilities;
 };
 
 }
diff --git a/Userland/Libraries/LibWeb/HTML/Navigator.idl b/Userland/Libraries/LibWeb/HTML/Navigator.idl
index 92655d8189a..94f31502a87 100644
--- a/Userland/Libraries/LibWeb/HTML/Navigator.idl
+++ b/Userland/Libraries/LibWeb/HTML/Navigator.idl
@@ -8,6 +8,7 @@
 #import <HTML/PluginArray.idl>
 #import <HTML/ServiceWorkerContainer.idl>
 #import <HTML/UserActivation.idl>
+#import <MediaCapabilitiesAPI/MediaCapabilities.idl>
 #import <StorageAPI/NavigatorStorage.idl>
 
 // https://html.spec.whatwg.org/multipage/system-state.html#navigator
@@ -29,6 +30,9 @@ interface Navigator {
 
     // https://w3c.github.io/ServiceWorker/#navigator-serviceworker
     [SecureContext, SameObject] readonly attribute ServiceWorkerContainer serviceWorker;
+
+    // https://w3c.github.io/media-capabilities/#dom-navigator-mediacapabilities
+    [SameObject] readonly attribute MediaCapabilities mediaCapabilities;
 };
 
 // NOTE: As NavigatorContentUtils, NavigatorCookies, NavigatorPlugins, and NavigatorAutomationInformation