diff --git a/src/Predictalytics.Api/wwwroot/apple-touch-icon.png b/src/Predictalytics.Api/wwwroot/apple-touch-icon.png
new file mode 100644
index 0000000..4f5083a
Binary files /dev/null and b/src/Predictalytics.Api/wwwroot/apple-touch-icon.png differ
diff --git a/src/Predictalytics.Api/wwwroot/docs.html b/src/Predictalytics.Api/wwwroot/docs.html
index ac20183..b6168b5 100644
--- a/src/Predictalytics.Api/wwwroot/docs.html
+++ b/src/Predictalytics.Api/wwwroot/docs.html
@@ -4,6 +4,9 @@
   <meta charset="utf-8">
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>Predictalytics API Reference</title>
+  <link rel="icon" href="/favicon.ico" sizes="any">
+  <link rel="icon" type="image/png" href="/icon-192.png" sizes="192x192">
+  <link rel="apple-touch-icon" href="/apple-touch-icon.png">
   <link rel="preconnect" href="https://fonts.googleapis.com">
   <link href="https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;600;700;800&family=Roboto+Mono:wght@400;500;600;700&display=swap" rel="stylesheet">
   <style>
diff --git a/src/Predictalytics.Api/wwwroot/favicon.ico b/src/Predictalytics.Api/wwwroot/favicon.ico
new file mode 100644
index 0000000..6fca0b1
Binary files /dev/null and b/src/Predictalytics.Api/wwwroot/favicon.ico differ
diff --git a/src/Predictalytics.Api/wwwroot/icon-192.png b/src/Predictalytics.Api/wwwroot/icon-192.png
new file mode 100644
index 0000000..3ab2d01
Binary files /dev/null and b/src/Predictalytics.Api/wwwroot/icon-192.png differ
diff --git a/src/Predictalytics.Api/wwwroot/icon-512.png b/src/Predictalytics.Api/wwwroot/icon-512.png
new file mode 100644
index 0000000..3562335
Binary files /dev/null and b/src/Predictalytics.Api/wwwroot/icon-512.png differ
diff --git a/src/Predictalytics.Api/wwwroot/index.html b/src/Predictalytics.Api/wwwroot/index.html
index ea8cf99..b1a0b99 100644
--- a/src/Predictalytics.Api/wwwroot/index.html
+++ b/src/Predictalytics.Api/wwwroot/index.html
@@ -5,6 +5,9 @@
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <meta name="description" content="Predictalytics — Multi-Platform Prediction Market Smart-Money Tracker & Analytics">
   <title>Predictalytics</title>
+  <link rel="icon" href="/favicon.ico" sizes="any">
+  <link rel="icon" type="image/png" href="/icon-192.png" sizes="192x192">
+  <link rel="apple-touch-icon" href="/apple-touch-icon.png">
   <link rel="stylesheet" href="css/style.css?v=20260715">
   <script src="https://cdn.jsdelivr.net/npm/chart.js@4.4.4/dist/chart.umd.min.js"></script>
 </head>
diff --git a/src/Predictalytics.Api/wwwroot/landing.html b/src/Predictalytics.Api/wwwroot/landing.html
index 99a9f44..c7b6692 100644
--- a/src/Predictalytics.Api/wwwroot/landing.html
+++ b/src/Predictalytics.Api/wwwroot/landing.html
@@ -4,6 +4,9 @@
   <meta charset="utf-8">
   <meta name="viewport" content="width=device-width, initial-scale=1">
   <title>Predictalytics — See every trader and market before the crowd does</title>
+  <link rel="icon" href="/favicon.ico" sizes="any">
+  <link rel="icon" type="image/png" href="/icon-192.png" sizes="192x192">
+  <link rel="apple-touch-icon" href="/apple-touch-icon.png">
   <link rel="preconnect" href="https://fonts.googleapis.com">
   <link href="https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;600;700;800&family=Roboto+Mono:wght@400;500;600;700&display=swap" rel="stylesheet">
   <style>
diff --git a/src/Predictalytics.Shell/Assets/README.md b/src/Predictalytics.Shell/Assets/README.md
new file mode 100644
index 0000000..186147c
--- /dev/null
+++ b/src/Predictalytics.Shell/Assets/README.md
@@ -0,0 +1,26 @@
+# Programm-Icon
+
+`predictalytics.ico` ist die **einzige Quelle**. Alles andere ist daraus abgeleitet:
+
+| Datei | Wozu |
+|---|---|
+| `predictalytics.ico` (9 Größen, 16–256) | `<ApplicationIcon>` in `Predictalytics.Shell.csproj` — Explorer, Taskleiste, Task-Manager unter Windows |
+| `predictalytics.png` (256) | `Window.Icon` in `MainWindow.axaml` und `LicenseWindow.axaml`; Dialoge erben es vom Besitzerfenster. Bewusst PNG, weil Skia unter Linux kein ICO dekodiert |
+| `Predictalytics.Api/wwwroot/favicon.ico` (16–48) | Browser-Tab der Web-UI |
+| `Predictalytics.Api/wwwroot/apple-touch-icon.png` (180) | iOS-Homescreen |
+| `Predictalytics.Api/wwwroot/icon-192.png`, `icon-512.png` | Verlinkt aus `index.html`, `landing.html`, `docs.html` |
+
+Ersetzt du das Icon, tausche `predictalytics.ico` aus und erzeuge den Rest neu:
+
+```bash
+python - <<'PY'
+from PIL import Image
+src = 'src/Predictalytics.Shell/Assets/predictalytics.ico'
+im = Image.open(src); im.size = (256, 256); im.load(); im = im.convert('RGBA')
+im.save('src/Predictalytics.Shell/Assets/predictalytics.png', optimize=True)
+im.save('src/Predictalytics.Api/wwwroot/favicon.ico',
+        sizes=[(16,16),(24,24),(32,32),(48,48)])
+for n, name in [(180,'apple-touch-icon.png'), (192,'icon-192.png'), (512,'icon-512.png')]:
+    im.resize((n,n), Image.LANCZOS).save(f'src/Predictalytics.Api/wwwroot/{name}', optimize=True)
+PY
+```
diff --git a/src/Predictalytics.Shell/Assets/predictalytics.ico b/src/Predictalytics.Shell/Assets/predictalytics.ico
new file mode 100644
index 0000000..26849cb
Binary files /dev/null and b/src/Predictalytics.Shell/Assets/predictalytics.ico differ
diff --git a/src/Predictalytics.Shell/Assets/predictalytics.png b/src/Predictalytics.Shell/Assets/predictalytics.png
new file mode 100644
index 0000000..2c682d7
Binary files /dev/null and b/src/Predictalytics.Shell/Assets/predictalytics.png differ
diff --git a/src/Predictalytics.Shell/Predictalytics.Shell.csproj b/src/Predictalytics.Shell/Predictalytics.Shell.csproj
index 5fc7249..c13bb04 100644
--- a/src/Predictalytics.Shell/Predictalytics.Shell.csproj
+++ b/src/Predictalytics.Shell/Predictalytics.Shell.csproj
@@ -9,8 +9,18 @@
     <AvaloniaUseCompiledBindingsByDefault>true</AvaloniaUseCompiledBindingsByDefault>
     <BuiltInComInteropSupport>true</BuiltInComInteropSupport>
     <ApplicationManifest>app.manifest</ApplicationManifest>
+    <!-- Icon der Programmdatei. Unter Windows das, was Explorer, Taskleiste und
+         Task-Manager anzeigen — ohne das traegt jede unserer Anwendungen auf dem
+         Server dasselbe generische Platzhalter-Icon. -->
+    <ApplicationIcon>Assets\predictalytics.ico</ApplicationIcon>
   </PropertyGroup>
 
+  <ItemGroup>
+    <!-- Fenstericon fuer Avalonia. Die .ico bleibt aussen vor: sie geht ueber
+         <ApplicationIcon> in die Programmdatei, und Skia dekodiert ohnehin nur PNG. -->
+    <AvaloniaResource Include="Assets\**" Exclude="Assets\predictalytics.ico" />
+  </ItemGroup>
+
   <ItemGroup>
     <PackageReference Include="Avalonia" />
     <PackageReference Include="Avalonia.Desktop" />
diff --git a/src/Predictalytics.Shell/Views/Dialogs.cs b/src/Predictalytics.Shell/Views/Dialogs.cs
index ba815fe..296654f 100644
--- a/src/Predictalytics.Shell/Views/Dialogs.cs
+++ b/src/Predictalytics.Shell/Views/Dialogs.cs
@@ -37,7 +37,10 @@ public static class Dialogs
             MaxWidth = 640,
             WindowStartupLocation = WindowStartupLocation.CenterOwner,
             CanResize = false,
-            ShowInTaskbar = false
+            ShowInTaskbar = false,
+            // Ohne das zeigt die Titelleiste des Dialogs das leere Standardsymbol
+            // statt des Programmicons.
+            Icon = owner.Icon
         };
 
         for (var i = 0; i < buttons.Length; i++)
diff --git a/src/Predictalytics.Shell/Views/LicenseWindow.axaml b/src/Predictalytics.Shell/Views/LicenseWindow.axaml
index cec3a4a..8832490 100644
--- a/src/Predictalytics.Shell/Views/LicenseWindow.axaml
+++ b/src/Predictalytics.Shell/Views/LicenseWindow.axaml
@@ -2,6 +2,7 @@
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         x:Class="Predictalytics.Shell.Views.LicenseWindow"
         Title="Predictalytics — Lizenzaktivierung"
+        Icon="/Assets/predictalytics.png"
         Width="580" SizeToContent="Height"
         CanResize="False"
         WindowStartupLocation="CenterScreen">
diff --git a/src/Predictalytics.Shell/Views/MainWindow.axaml b/src/Predictalytics.Shell/Views/MainWindow.axaml
index 089433a..81f362c 100644
--- a/src/Predictalytics.Shell/Views/MainWindow.axaml
+++ b/src/Predictalytics.Shell/Views/MainWindow.axaml
@@ -7,6 +7,7 @@
         x:Class="Predictalytics.Shell.Views.MainWindow"
         x:DataType="vm:MainWindowViewModel"
         Title="Predictalytics Analytics — Backend Server"
+        Icon="/Assets/predictalytics.png"
         Width="1400" Height="900"
         MinWidth="900" MinHeight="600"
         WindowStartupLocation="CenterScreen">