diff --git a/Userland/Libraries/LibWeb/Bindings/WindowObject.cpp b/Userland/Libraries/LibWeb/Bindings/WindowObject.cpp
index fb9079eb21..a616a69d8d 100644
--- a/Userland/Libraries/LibWeb/Bindings/WindowObject.cpp
+++ b/Userland/Libraries/LibWeb/Bindings/WindowObject.cpp
@@ -114,6 +114,7 @@ void WindowObject::initialize_global_object()
     define_direct_property("CSS", heap().allocate<CSSNamespace>(*this, *this), 0);
 
     define_native_accessor("localStorage", local_storage_getter, {}, attr);
+    define_native_accessor("sessionStorage", session_storage_getter, {}, attr);
     define_native_accessor("origin", origin_getter, {}, attr);
 
     // Legacy
@@ -649,6 +650,13 @@ JS_DEFINE_NATIVE_FUNCTION(WindowObject::local_storage_getter)
     return wrap(global_object, *impl->local_storage());
 }
 
+JS_DEFINE_NATIVE_FUNCTION(WindowObject::session_storage_getter)
+{
+    auto* impl = TRY(impl_from(vm, global_object));
+    // FIXME: sessionStorage may throw. We have to deal with that here.
+    return wrap(global_object, *impl->session_storage());
+}
+
 #define __ENUMERATE(attribute, event_name)                                                                                 \
     JS_DEFINE_NATIVE_FUNCTION(WindowObject::attribute##_getter)                                                            \
     {                                                                                                                      \
diff --git a/Userland/Libraries/LibWeb/Bindings/WindowObject.h b/Userland/Libraries/LibWeb/Bindings/WindowObject.h
index 2e35d12bef..3cf9939b58 100644
--- a/Userland/Libraries/LibWeb/Bindings/WindowObject.h
+++ b/Userland/Libraries/LibWeb/Bindings/WindowObject.h
@@ -107,6 +107,7 @@ private:
     JS_DECLARE_NATIVE_FUNCTION(post_message);
 
     JS_DECLARE_NATIVE_FUNCTION(local_storage_getter);
+    JS_DECLARE_NATIVE_FUNCTION(session_storage_getter);
     JS_DECLARE_NATIVE_FUNCTION(origin_getter);
 
     JS_DECLARE_NATIVE_FUNCTION(alert);
diff --git a/Userland/Libraries/LibWeb/HTML/Window.cpp b/Userland/Libraries/LibWeb/HTML/Window.cpp
index d016feb793..187d6cbb4d 100644
--- a/Userland/Libraries/LibWeb/HTML/Window.cpp
+++ b/Userland/Libraries/LibWeb/HTML/Window.cpp
@@ -528,6 +528,17 @@ RefPtr<HTML::Storage> Window::local_storage()
     });
 }
 
+// https://html.spec.whatwg.org/multipage/webstorage.html#dom-sessionstorage
+RefPtr<HTML::Storage> Window::session_storage()
+{
+    // FIXME: Implement according to spec.
+
+    static HashMap<Origin, NonnullRefPtr<HTML::Storage>> session_storage_per_origin;
+    return session_storage_per_origin.ensure(associated_document().origin(), [] {
+        return HTML::Storage::create();
+    });
+}
+
 // https://html.spec.whatwg.org/multipage/browsers.html#dom-parent
 Window* Window::parent()
 {
diff --git a/Userland/Libraries/LibWeb/HTML/Window.h b/Userland/Libraries/LibWeb/HTML/Window.h
index cb6c7414f5..252e7da939 100644
--- a/Userland/Libraries/LibWeb/HTML/Window.h
+++ b/Userland/Libraries/LibWeb/HTML/Window.h
@@ -104,6 +104,7 @@ public:
     Selection::Selection* get_selection();
 
     RefPtr<HTML::Storage> local_storage();
+    RefPtr<HTML::Storage> session_storage();
 
     Window* parent();