diff --git a/Libraries/LibGUI/GWindow.cpp b/Libraries/LibGUI/GWindow.cpp
index 3ab70d20c9..d341bef256 100644
--- a/Libraries/LibGUI/GWindow.cpp
+++ b/Libraries/LibGUI/GWindow.cpp
@@ -322,6 +322,10 @@ void GWindow::event(CEvent& event)
     }
 
     if (event.type() == GEvent::WindowCloseRequest) {
+        if (on_close_request) {
+            if (on_close_request() == GWindow::CloseRequestDecision::StayOpen)
+                return;
+        }
         close();
         return;
     }
diff --git a/Libraries/LibGUI/GWindow.h b/Libraries/LibGUI/GWindow.h
index 5937a18f6f..3401ba6a63 100644
--- a/Libraries/LibGUI/GWindow.h
+++ b/Libraries/LibGUI/GWindow.h
@@ -4,9 +4,9 @@
 #include <AK/HashMap.h>
 #include <AK/WeakPtr.h>
 #include <LibCore/CObject.h>
-#include <LibGUI/GWindowType.h>
 #include <LibDraw/GraphicsBitmap.h>
 #include <LibDraw/Rect.h>
+#include <LibGUI/GWindowType.h>
 
 class GWidget;
 class GWMEvent;
@@ -57,6 +57,13 @@ public:
     bool should_destroy_on_close() { return m_destroy_on_close; }
     void set_should_destroy_on_close(bool b) { m_destroy_on_close = b; }
 
+    enum class CloseRequestDecision {
+        StayOpen,
+        Close,
+    };
+
+    Function<CloseRequestDecision()> on_close_request;
+
     int x() const { return rect().x(); }
     int y() const { return rect().y(); }
     int width() const { return rect().width(); }