diff --git a/dom/geolocation/Geolocation.cpp b/dom/geolocation/Geolocation.cpp
index 7858c69827b3..efcd459ecdef 100644
--- a/dom/geolocation/Geolocation.cpp
+++ b/dom/geolocation/Geolocation.cpp
@@ -20,6 +20,7 @@
 #include "mozilla/Unused.h"
 #include "mozilla/WeakPtr.h"
 #include "mozilla/EventStateManager.h"
+#include "mozilla/WidgetUtilsGtk.h"
 #include "nsComponentManagerUtils.h"
 #include "nsContentPermissionHelper.h"
 #include "nsContentUtils.h"
@@ -43,6 +44,10 @@ class nsIPrincipal;
 #  include "GpsdLocationProvider.h"
 #endif
 
+#ifdef MOZ_ENABLE_DBUS
+#  include "PortalLocationProvider.h"
+#endif
+
 #ifdef MOZ_WIDGET_COCOA
 #  include "CoreLocationLocationProvider.h"
 #endif
@@ -494,6 +499,11 @@ nsresult nsGeolocationService::Init() {
     mProvider = new GpsdLocationProvider();
   }
 #  endif
+#  ifdef MOZ_ENABLE_DBUS
+  if (!mProvider && widget::ShouldUsePortal(widget::PortalKind::Location)) {
+    mProvider = new PortalLocationProvider();
+  }
+#  endif
 #endif
 
 #ifdef MOZ_WIDGET_COCOA
diff --git a/dom/geolocation/moz.build b/dom/geolocation/moz.build
index 5c7f7471818c..8482c8aa1fc1 100644
--- a/dom/geolocation/moz.build
+++ b/dom/geolocation/moz.build
@@ -55,3 +55,7 @@ elif CONFIG["MOZ_WIDGET_TOOLKIT"] == "gtk":
             "/dom/system/linux",
         ]
         DEFINES["MOZ_GPSD"] = True
+    if CONFIG["MOZ_ENABLE_DBUS"]:
+        LOCAL_INCLUDES += ["/dom/system/linux"]
+        CXXFLAGS += CONFIG["MOZ_DBUS_GLIB_CFLAGS"]
+        CXXFLAGS += CONFIG["MOZ_GTK3_CFLAGS"]
diff --git a/dom/system/linux/PortalLocationProvider.cpp b/dom/system/linux/PortalLocationProvider.cpp
new file mode 100644
index 000000000000..bdae871a52f4
--- /dev/null
+++ b/dom/system/linux/PortalLocationProvider.cpp
@@ -0,0 +1,356 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "PortalLocationProvider.h"
+#include <errno.h>
+#include "MLSFallback.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/FloatingPoint.h"
+#include "mozilla/LazyIdleThread.h"
+#include "mozilla/Logging.h"
+#include "mozilla/dom/GeolocationPositionErrorBinding.h"
+#include "GeolocationPosition.h"
+#include "nsProxyRelease.h"
+#include "nsThreadUtils.h"
+#include "prtime.h"
+#include "mozilla/GUniquePtr.h"
+#include "mozilla/UniquePtrExtensions.h"
+#include "mozilla/XREAppData.h"
+
+#include <gio/gio.h>
+#include <glib-object.h>
+
+extern const mozilla::XREAppData* gAppData;
+
+namespace mozilla::dom {
+
+#ifdef MOZ_LOGGING
+static LazyLogModule sPortalLog("Portal");
+#  define LOG_PORTAL(...) MOZ_LOG(sPortalLog, LogLevel::Debug, (__VA_ARGS__))
+#else
+#  define LOG_PORTAL(...)
+#endif /* MOZ_LOGGING */
+
+const char kDesktopBusName[] = "org.freedesktop.portal.Desktop";
+const char kSessionInterfaceName[] = "org.freedesktop.portal.Session";
+
+/**
+ * |MLSGeolocationUpdate| provides a fallback if Portal is not supported.
+ */
+class PortalLocationProvider::MLSGeolocationUpdate final
+    : public nsIGeolocationUpdate {
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIGEOLOCATIONUPDATE
+
+  explicit MLSGeolocationUpdate(nsIGeolocationUpdate* aCallback);
+
+ protected:
+  ~MLSGeolocationUpdate() = default;
+
+ private:
+  const nsCOMPtr<nsIGeolocationUpdate> mCallback;
+};
+
+PortalLocationProvider::MLSGeolocationUpdate::MLSGeolocationUpdate(
+    nsIGeolocationUpdate* aCallback)
+    : mCallback(aCallback) {
+  MOZ_ASSERT(mCallback);
+}
+
+NS_IMPL_ISUPPORTS(PortalLocationProvider::MLSGeolocationUpdate,
+                  nsIGeolocationUpdate);
+
+// nsIGeolocationUpdate
+//
+
+NS_IMETHODIMP
+PortalLocationProvider::MLSGeolocationUpdate::Update(
+    nsIDOMGeoPosition* aPosition) {
+  nsCOMPtr<nsIDOMGeoPositionCoords> coords;
+  aPosition->GetCoords(getter_AddRefs(coords));
+  if (!coords) {
+    return NS_ERROR_FAILURE;
+  }
+  LOG_PORTAL("MLS is updating position\n");
+  return mCallback->Update(aPosition);
+}
+
+NS_IMETHODIMP
+PortalLocationProvider::MLSGeolocationUpdate::NotifyError(uint16_t aError) {
+  nsCOMPtr<nsIGeolocationUpdate> callback(mCallback);
+  return callback->NotifyError(aError);
+}
+
+//
+// PortalLocationProvider
+//
+
+PortalLocationProvider::PortalLocationProvider() = default;
+
+PortalLocationProvider::~PortalLocationProvider() {
+  if (mDBUSLocationProxy || mRefreshTimer || mMLSProvider) {
+    NS_WARNING(
+        "PortalLocationProvider: Shutdown() had not been called before "
+        "destructor.");
+    Shutdown();
+  }
+}
+
+void PortalLocationProvider::Update(nsIDOMGeoPosition* aPosition) {
+  if (!mCallback) {
+    return;  // not initialized or already shut down
+  }
+
+  if (mMLSProvider) {
+    LOG_PORTAL(
+        "Update from location portal received: Cancelling fallback MLS "
+        "provider\n");
+    mMLSProvider->Shutdown();
+    mMLSProvider = nullptr;
+  }
+
+  LOG_PORTAL("Send updated location to the callback %p", mCallback.get());
+  mCallback->Update(aPosition);
+
+  aPosition->GetCoords(getter_AddRefs(mLastGeoPositionCoords));
+  // Schedule sending repetitive updates because we don't get more until
+  // position is changed from portal. That would lead to timeout on the
+  // Firefox side.
+  SetRefreshTimer(5000);
+}
+
+void PortalLocationProvider::NotifyError(int aError) {
+  LOG_PORTAL("*****NotifyError %d\n", aError);
+  if (!mCallback) {
+    return;  // not initialized or already shut down
+  }
+
+  if (!mMLSProvider) {
+    /* With Portal failed, we restart MLS. It will be canceled once we
+     * get another location from Portal. Start it immediately.
+     */
+    mMLSProvider = MakeAndAddRef<MLSFallback>(0);
+    mMLSProvider->Startup(new MLSGeolocationUpdate(mCallback));
+  }
+
+  nsCOMPtr<nsIGeolocationUpdate> callback(mCallback);
+  callback->NotifyError(aError);
+}
+
+NS_IMPL_ISUPPORTS(PortalLocationProvider, nsIGeolocationProvider)
+
+static void location_updated_signal_cb(GDBusProxy* proxy, gchar* sender_name,
+                                       gchar* signal_name, GVariant* parameters,
+                                       gpointer user_data) {
+  LOG_PORTAL("Signal: %s received from: %s\n", sender_name, signal_name);
+
+  if (g_strcmp0(signal_name, "LocationUpdated")) {
+    LOG_PORTAL("Unexpected signal %s received", signal_name);
+    return;
+  }
+
+  auto* locationProvider = static_cast<PortalLocationProvider*>(user_data);
+  RefPtr<GVariant> response_data;
+  gchar* session_handle;
+  g_variant_get(parameters, "(o@a{sv})", &session_handle,
+                response_data.StartAssignment());
+  if (!response_data) {
+    LOG_PORTAL("Missing response data from portal\n");
+    locationProvider->NotifyError(
+        GeolocationPositionError_Binding::POSITION_UNAVAILABLE);
+    return;
+  }
+  LOG_PORTAL("Session handle: %s Response data: %s\n", session_handle,
+             GUniquePtr<gchar>(g_variant_print(response_data, TRUE)).get());
+  g_free(session_handle);
+
+  double lat = 0;
+  double lon = 0;
+  if (!g_variant_lookup(response_data, "Latitude", "d", &lat) ||
+      !g_variant_lookup(response_data, "Longitude", "d", &lon)) {
+    locationProvider->NotifyError(
+        GeolocationPositionError_Binding::POSITION_UNAVAILABLE);
+    return;
+  }
+
+  double alt = UnspecifiedNaN<double>();
+  g_variant_lookup(response_data, "Altitude", "d", &alt);
+  double vError = 0;
+  double hError = UnspecifiedNaN<double>();
+  g_variant_lookup(response_data, "Accuracy", "d", &hError);
+  double heading = UnspecifiedNaN<double>();
+  g_variant_lookup(response_data, "Heading", "d", &heading);
+  double speed = UnspecifiedNaN<double>();
+  g_variant_lookup(response_data, "Speed", "d", &speed);
+
+  locationProvider->Update(new nsGeoPosition(lat, lon, alt, hError, vError,
+                                             heading, speed,
+                                             PR_Now() / PR_USEC_PER_MSEC));
+}
+
+NS_IMETHODIMP
+PortalLocationProvider::Startup() {
+  LOG_PORTAL("Starting location portal");
+  if (mDBUSLocationProxy) {
+    LOG_PORTAL("Proxy already started.\n");
+    return NS_OK;
+  }
+
+  // Create dbus proxy for the Location portal
+  GUniquePtr<GError> error;
+  mDBUSLocationProxy = dont_AddRef(g_dbus_proxy_new_for_bus_sync(
+      G_BUS_TYPE_SESSION, G_DBUS_PROXY_FLAGS_NONE,
+      nullptr, /* GDBusInterfaceInfo */
+      kDesktopBusName, "/org/freedesktop/portal/desktop",
+      "org.freedesktop.portal.Location", nullptr, /* GCancellable */
+      getter_Transfers(error)));
+  if (!mDBUSLocationProxy) {
+    g_printerr("Error creating location dbus proxy: %s\n", error->message);
+    return NS_OK;  // fallback to MLS
+  }
+
+  // Listen to signals which will be send to us with the location data
+  mDBUSSignalHandler =
+      g_signal_connect(mDBUSLocationProxy, "g-signal",
+                       G_CALLBACK(location_updated_signal_cb), this);
+
+  // Call CreateSession of the location portal
+  GVariantBuilder builder;
+
+  nsAutoCString appName(gAppData->remotingName);
+  appName.ReplaceChar("+/=-", '_');
+  g_variant_builder_init(&builder, G_VARIANT_TYPE_VARDICT);
+  g_variant_builder_add(&builder, "{sv}", "session_handle_token",
+                        g_variant_new_string(appName.get()));
+
+  RefPtr<GVariant> result = dont_AddRef(g_dbus_proxy_call_sync(
+      mDBUSLocationProxy, "CreateSession", g_variant_new("(a{sv})", &builder),
+      G_DBUS_CALL_FLAGS_NONE, -1, nullptr, getter_Transfers(error)));
+
+  g_variant_builder_clear(&builder);
+
+  if (!result) {
+    g_printerr("Error calling CreateSession method: %s\n", error->message);
+    return NS_OK;  // fallback to MLS
+  }
+
+  // Start to listen to the location changes
+  g_variant_builder_init(&builder, G_VARIANT_TYPE_VARDICT);
+
+  // TODO Use wayland:handle as described in
+  // https://flatpak.github.io/xdg-desktop-portal/#parent_window
+  const gchar* parent_window = "";
+  gchar* portalSession;
+  g_variant_get_child(result, 0, "o", &portalSession);
+  mPortalSession.reset(portalSession);
+
+  result = g_dbus_proxy_call_sync(
+      mDBUSLocationProxy, "Start",
+      g_variant_new("(osa{sv})", mPortalSession.get(), parent_window, &builder),
+      G_DBUS_CALL_FLAGS_NONE, -1, nullptr, getter_Transfers(error));
+
+  g_variant_builder_clear(&builder);
+
+  if (!result) {
+    g_printerr("Error calling Start method: %s\n", error->message);
+    return NS_OK;  // fallback to MLS
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+PortalLocationProvider::Watch(nsIGeolocationUpdate* aCallback) {
+  mCallback = aCallback;
+
+  if (mLastGeoPositionCoords) {
+    // We cannot immediately call the Update there becase the window is not
+    // yet ready for that.
+    LOG_PORTAL(
+        "Update location in 1ms because we have the valid coords cached.");
+    SetRefreshTimer(1);
+    return NS_OK;
+  }
+
+  /* The MLS fallback will kick in after 12 seconds if portal
+   * doesn't provide location information within time. Once we
+   * see the first message from portal, the fallback will be
+   * disabled in |Update|.
+   */
+  mMLSProvider = MakeAndAddRef<MLSFallback>(12000);
+  mMLSProvider->Startup(new MLSGeolocationUpdate(aCallback));
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP PortalLocationProvider::GetName(nsACString& aName) {
+  aName.AssignLiteral("PortalLocationProvider");
+  return NS_OK;
+}
+
+void PortalLocationProvider::SetRefreshTimer(int aDelay) {
+  LOG_PORTAL("SetRefreshTimer for %p to %d ms\n", this, aDelay);
+  if (!mRefreshTimer) {
+    NS_NewTimerWithCallback(getter_AddRefs(mRefreshTimer), this, aDelay,
+                            nsITimer::TYPE_ONE_SHOT);
+  } else {
+    mRefreshTimer->Cancel();
+    mRefreshTimer->InitWithCallback(this, aDelay, nsITimer::TYPE_ONE_SHOT);
+  }
+}
+
+NS_IMETHODIMP
+PortalLocationProvider::Notify(nsITimer* timer) {
+  // We need to reschedule the timer because we won't get any update
+  // from portal until the location is changed. That would cause
+  // watchPosition to fail with TIMEOUT error.
+  SetRefreshTimer(5000);
+  if (mLastGeoPositionCoords) {
+    LOG_PORTAL("Update location callback with latest coords.");
+    mCallback->Update(
+        new nsGeoPosition(mLastGeoPositionCoords, PR_Now() / PR_USEC_PER_MSEC));
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+PortalLocationProvider::Shutdown() {
+  LOG_PORTAL("Shutdown location provider");
+  if (mRefreshTimer) {
+    mRefreshTimer->Cancel();
+    mRefreshTimer = nullptr;
+  }
+  mLastGeoPositionCoords = nullptr;
+  if (mDBUSLocationProxy) {
+    g_signal_handler_disconnect(mDBUSLocationProxy, mDBUSSignalHandler);
+    LOG_PORTAL("calling Close method to the session interface...\n");
+    RefPtr<GDBusMessage> message = dont_AddRef(g_dbus_message_new_method_call(
+        kDesktopBusName, mPortalSession.get(), kSessionInterfaceName, "Close"));
+    mPortalSession = nullptr;
+    if (message) {
+      GUniquePtr<GError> error;
+      GDBusConnection* connection =
+          g_dbus_proxy_get_connection(mDBUSLocationProxy);
+      g_dbus_connection_send_message(
+          connection, message, G_DBUS_SEND_MESSAGE_FLAGS_NONE,
+          /*out_serial=*/nullptr, getter_Transfers(error));
+      if (error) {
+        g_printerr("Failed to close the session: %s\n", error->message);
+      }
+    }
+    mDBUSLocationProxy = nullptr;
+  }
+  if (mMLSProvider) {
+    mMLSProvider->Shutdown();
+    mMLSProvider = nullptr;
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+PortalLocationProvider::SetHighAccuracy(bool aHigh) { return NS_OK; }
+
+}  // namespace mozilla::dom
diff --git a/dom/system/linux/PortalLocationProvider.h b/dom/system/linux/PortalLocationProvider.h
new file mode 100644
index 000000000000..e7ead0ab5c79
--- /dev/null
+++ b/dom/system/linux/PortalLocationProvider.h
@@ -0,0 +1,54 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef PortalLocationProvider_h
+#define PortalLocationProvider_h
+
+#include "nsCOMPtr.h"
+#include "mozilla/GRefPtr.h"
+#include "mozilla/GUniquePtr.h"
+#include "Geolocation.h"
+#include "nsIGeolocationProvider.h"
+#include <gio/gio.h>
+
+class MLSFallback;
+
+namespace mozilla::dom {
+
+class PortalLocationProvider final : public nsIGeolocationProvider,
+                                     public nsITimerCallback,
+                                     public nsINamed {
+  class MLSGeolocationUpdate;
+
+ public:
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIGEOLOCATIONPROVIDER
+  NS_DECL_NSITIMERCALLBACK
+  NS_DECL_NSINAMED
+
+  PortalLocationProvider();
+
+  void Update(nsIDOMGeoPosition* aPosition);
+  MOZ_CAN_RUN_SCRIPT_BOUNDARY
+  void NotifyError(int aError);
+
+ private:
+  ~PortalLocationProvider();
+  void SetRefreshTimer(int aDelay);
+
+  RefPtr<GDBusProxy> mDBUSLocationProxy;
+  gulong mDBUSSignalHandler = 0;
+
+  GUniquePtr<gchar> mPortalSession;
+  nsCOMPtr<nsIGeolocationUpdate> mCallback;
+  RefPtr<MLSFallback> mMLSProvider;
+  nsCOMPtr<nsIDOMGeoPositionCoords> mLastGeoPositionCoords;
+  nsCOMPtr<nsITimer> mRefreshTimer;
+};
+
+}  // namespace mozilla::dom
+
+#endif /* GpsLocationProvider_h */
diff --git a/dom/system/linux/moz.build b/dom/system/linux/moz.build
index ab9d076deb16..840066a51cd4 100644
--- a/dom/system/linux/moz.build
+++ b/dom/system/linux/moz.build
@@ -13,4 +13,11 @@ if CONFIG["MOZ_GPSD"]:
 
     LOCAL_INCLUDES += ["/dom/geolocation"]
 
+
+if CONFIG["MOZ_ENABLE_DBUS"]:
+    SOURCES += ["PortalLocationProvider.cpp"]
+    LOCAL_INCLUDES += ["/dom/geolocation"]
+    CXXFLAGS += CONFIG["MOZ_DBUS_GLIB_CFLAGS"]
+    CXXFLAGS += CONFIG["MOZ_GTK3_CFLAGS"]
+
 FINAL_LIBRARY = "xul"
diff --git a/modules/libpref/init/StaticPrefList.yaml b/modules/libpref/init/StaticPrefList.yaml
index 2264cae0db10..bc4701e9e02e 100644
--- a/modules/libpref/init/StaticPrefList.yaml
+++ b/modules/libpref/init/StaticPrefList.yaml
@@ -13200,6 +13200,16 @@
   type: int32_t
   value: 2
   mirror: always
+
+# Whether to use XDG portal for geolocation.
+# https://flatpak.github.io/xdg-desktop-portal/#gdbus-org.freedesktop.portal.Location
+#  - 0: never
+#  - 1: always
+#  - 2: auto
+- name: widget.use-xdg-desktop-portal.location
+  type: int32_t
+  value: 2
+  mirror: always
 #endif
 
 #ifdef XP_WIN
diff --git a/widget/gtk/GRefPtr.h b/widget/gtk/GRefPtr.h
index 1ad6b7005401..6c118d68597e 100644
--- a/widget/gtk/GRefPtr.h
+++ b/widget/gtk/GRefPtr.h
@@ -39,6 +39,7 @@ GOBJECT_TRAITS(GDBusProxy)
 GOBJECT_TRAITS(GAppInfo)
 GOBJECT_TRAITS(GAppLaunchContext)
 GOBJECT_TRAITS(GdkDragContext)
+GOBJECT_TRAITS(GDBusMessage)
 GOBJECT_TRAITS(GdkPixbuf)
 
 #ifdef MOZ_ENABLE_DBUS
diff --git a/widget/gtk/WidgetUtilsGtk.cpp b/widget/gtk/WidgetUtilsGtk.cpp
index 33faa61f1b78..9b75a341b958 100644
--- a/widget/gtk/WidgetUtilsGtk.cpp
+++ b/widget/gtk/WidgetUtilsGtk.cpp
@@ -136,6 +136,8 @@ bool ShouldUsePortal(PortalKind aPortalKind) {
       case PortalKind::Settings:
         autoBehavior = true;
         return StaticPrefs::widget_use_xdg_desktop_portal_settings();
+      case PortalKind::Location:
+        return StaticPrefs::widget_use_xdg_desktop_portal_location();
     }
     return 2;
   }();
diff --git a/widget/gtk/WidgetUtilsGtk.h b/widget/gtk/WidgetUtilsGtk.h
index cb163d33594c..960e206f23c5 100644
--- a/widget/gtk/WidgetUtilsGtk.h
+++ b/widget/gtk/WidgetUtilsGtk.h
@@ -44,6 +44,7 @@ enum class PortalKind {
   FilePicker,
   MimeHandler,
   Settings,
+  Location,
 };
 bool ShouldUsePortal(PortalKind);