diff --git a/applets/notifications/CMakeLists.txt b/applets/notifications/CMakeLists.txt
--- a/applets/notifications/CMakeLists.txt
+++ b/applets/notifications/CMakeLists.txt
@@ -15,6 +15,7 @@
                       Qt5::Quick # for QQmlParserStatus
                       KF5::I18n
                       KF5::Plasma
+                      KF5::PlasmaQuick
                       KF5::KIOWidgets # for PreviewJob
                       )
 
diff --git a/applets/notifications/notificationapplet.h b/applets/notifications/notificationapplet.h
--- a/applets/notifications/notificationapplet.h
+++ b/applets/notifications/notificationapplet.h
@@ -33,6 +33,8 @@
 
     Q_PROPERTY(bool dragActive READ dragActive NOTIFY dragActiveChanged)
 
+    Q_PROPERTY(QWindow *focussedPlasmaDialog READ focussedPlasmaDialog NOTIFY focussedPlasmaDialogChanged)
+
 public:
     explicit NotificationApplet(QObject *parent, const QVariantList &data);
     ~NotificationApplet() override;
@@ -44,12 +46,15 @@
     Q_INVOKABLE bool isDrag(int oldX, int oldY, int newX, int newY) const;
     Q_INVOKABLE void startDrag(QQuickItem *item, const QUrl &url, const QPixmap &pixmap);
 
+    QWindow *focussedPlasmaDialog() const;
+
     Q_INVOKABLE void setSelectionClipboardText(const QString &text);
 
     Q_INVOKABLE bool isPrimaryScreen(const QRect &rect) const;
 
 signals:
     void dragActiveChanged();
+    void focussedPlasmaDialogChanged();
 
 private slots:
     void doDrag(QQuickItem *item, const QUrl &url, const QPixmap &pixmap);
diff --git a/applets/notifications/notificationapplet.cpp b/applets/notifications/notificationapplet.cpp
--- a/applets/notifications/notificationapplet.cpp
+++ b/applets/notifications/notificationapplet.cpp
@@ -23,12 +23,15 @@
 
 #include <QClipboard>
 #include <QDrag>
+#include <QGuiApplication>
 #include <QMimeData>
 #include <QQuickItem>
 #include <QQuickWindow>
 #include <QScreen>
 #include <QStyleHints>
 
+#include <PlasmaQuick/Dialog>
+
 #include "filemenu.h"
 #include "thumbnailer.h"
 
@@ -43,6 +46,8 @@
         qmlProtectModule(uri, 2);
         s_typesRegistered = true;
     }
+
+    connect(qApp, &QGuiApplication::focusWindowChanged, this, &NotificationApplet::focussedPlasmaDialogChanged);
 }
 
 NotificationApplet::~NotificationApplet() = default;
@@ -105,6 +110,11 @@
     emit dragActiveChanged();
 }
 
+QWindow *NotificationApplet::focussedPlasmaDialog() const
+{
+    return qobject_cast<PlasmaQuick::Dialog *>(qApp->focusWindow());
+}
+
 void NotificationApplet::setSelectionClipboardText(const QString &text)
 {
     // FIXME KDeclarative Clipboard item uses QClipboard::Mode for "mode"
diff --git a/applets/notifications/package/contents/ui/global/Globals.qml b/applets/notifications/package/contents/ui/global/Globals.qml
--- a/applets/notifications/package/contents/ui/global/Globals.qml
+++ b/applets/notifications/package/contents/ui/global/Globals.qml
@@ -238,7 +238,7 @@
         }
 
         for (var i = 0; i < popupInstantiator.count; ++i) {
-            var popup = popupInstantiator.objectAt(i);
+            let popup = popupInstantiator.objectAt(i);
             // Popup width is fixed, so don't rely on the actual window size
             var popupEffectiveWidth = popupWidth + popup.margins.left + popup.margins.right;
 
@@ -273,8 +273,18 @@
                 }
             }
 
-            // TODO would be nice to hide popups when systray or panel controller is open
-            popup.visible = visible;
+            popup.visible = Qt.binding(function() {
+                const dialog = plasmoid.nativeInterface.focussedPlasmaDialog;
+                if (dialog && dialog.visible && dialog !== popup) {
+                    // If the notification obscures any other Plasma dialog, hide it
+                    // No rect intersects in JS...
+                    if (dialog.x < popup.x + popup.width && popup.x < dialog.x + dialog.width && dialog.y < popup.y + popup.height && popup.y < dialog.y + dialog.height) {
+                        return false;
+                    }
+                }
+
+                return visible;
+            });
         }
     }