diff --git a/THEMES.md b/THEMES.md
index 5ca6b53..69c04ba 100644
--- a/THEMES.md
+++ b/THEMES.md
@@ -81,3 +81,11 @@ Usage: `/api/streak?user=yourusername&theme=rose`
 ![Nord](assets/themes/nord.png)
 
 Usage: `/api/streak?user=yourusername&theme=nord`
+
+## 🌆 Synthwave
+
+![Synthwave](assets/themes/synthwave.png)
+
+Retro 80s-inspired palette — deep indigo background, neon pink glow, crisp white text.
+
+Usage: `/api/streak?user=yourusername&theme=synthwave`
diff --git a/assets/themes/synthwave.png b/assets/themes/synthwave.png
new file mode 100644
index 0000000..d06f02d
Binary files /dev/null and b/assets/themes/synthwave.png differ
diff --git a/lib/svg/themes.ts b/lib/svg/themes.ts
index 779422d..0d5cef5 100644
--- a/lib/svg/themes.ts
+++ b/lib/svg/themes.ts
@@ -52,4 +52,9 @@ export const themes: Record<string, BadgeTheme> = {
     text: 'd8dee9',
     accent: '88c0d0',
   },
+  synthwave: {
+    bg: '0d0221',
+    text: 'f8f8f2',
+    accent: 'ff2d78',
+  },
 };