diff --git a/quickshell/services/python/theme_sync.py b/quickshell/services/python/theme_sync.py
index a6b556e..a8411ea 100644
--- a/quickshell/services/python/theme_sync.py
+++ b/quickshell/services/python/theme_sync.py
@@ -1453,6 +1453,141 @@ def sync_xresources(bg, surface, current_line, fg, accent, sub_accent):
     except Exception:
         pass
 
+def sync_obsidian(bg, surface, current_line, fg, accent, sub_accent, is_dark):
+    import json
+    home = os.path.expanduser('~')
+
+    # CSS Template for Obsidian Vaults
+    obsidian_css = f"""/* Auto-generated by Quickshell Theme Engine */
+.theme-dark, .theme-light, :root, body {{
+    --bg-primary: {bg} !important;
+    --bg-primary-alt: {surface} !important;
+    --bg-secondary: {surface} !important;
+    --bg-secondary-alt: {current_line} !important;
+
+    --background-primary: {bg} !important;
+    --background-primary-alt: {surface} !important;
+    --background-secondary: {surface} !important;
+    --background-secondary-alt: {current_line} !important;
+    --background-modifier-border: {current_line} !important;
+    --background-modifier-border-hover: {accent} !important;
+    --background-modifier-form-field: {surface} !important;
+
+    --text-normal: {fg} !important;
+    --text-muted: {fg} !important;
+    --text-faint: {current_line} !important;
+
+    --interactive-accent: {accent} !important;
+    --interactive-accent-hover: {sub_accent} !important;
+    --interactive-hover: {current_line} !important;
+
+    --text-accent: {accent} !important;
+    --text-accent-hover: {sub_accent} !important;
+    --nav-item-color-active: {accent} !important;
+    --nav-item-background-active: {surface} !important;
+    --tab-text-color-active: {accent} !important;
+
+    --bold-color: {accent} !important;
+    --italic-color: {sub_accent} !important;
+    --title-color: {fg} !important;
+    --h1-color: {accent} !important;
+    --h2-color: {sub_accent} !important;
+    --h3-color: {fg} !important;
+    --h4-color: {fg} !important;
+    --h5-color: {fg} !important;
+    --h6-color: {fg} !important;
+
+    --code-normal: {accent} !important;
+    --code-background: {surface} !important;
+
+    --scrollbar-thumb-bg: {current_line} !important;
+    --status-bar-bg: {surface} !important;
+    --titlebar-background: {bg} !important;
+    --titlebar-background-focused: {bg} !important;
+}}
+"""
+
+    vault_dirs = set()
+
+    # Search common Documents and Home locations for .obsidian folders
+    search_bases = [
+        home,
+        os.path.join(home, 'Documents'),
+        os.path.join(home, 'Obsidian'),
+        os.path.join(home, 'Vaults'),
+        os.path.join(home, 'Notes'),
+        os.path.join(home, '.var', 'app', 'md.obsidian.Obsidian', 'config', 'obsidian'),
+        os.path.join(home, '.config', 'obsidian')
+    ]
+
+    for sb in search_bases:
+        if os.path.exists(sb):
+            obs_dir = os.path.join(sb, '.obsidian')
+            if os.path.isdir(obs_dir):
+                vault_dirs.add(obs_dir)
+            try:
+                for child in os.listdir(sb):
+                    child_path = os.path.join(sb, child)
+                    if os.path.isdir(child_path):
+                        child_obs = os.path.join(child_path, '.obsidian')
+                        if os.path.isdir(child_obs):
+                            vault_dirs.add(child_obs)
+            except Exception: pass
+
+    # Search registered vault paths in obsidian.json
+    obsidian_json_paths = [
+        os.path.join(home, '.config', 'obsidian', 'obsidian.json'),
+        os.path.join(home, '.var', 'app', 'md.obsidian.Obsidian', 'config', 'obsidian', 'obsidian.json')
+    ]
+
+    for ojp in obsidian_json_paths:
+        if os.path.exists(ojp):
+            try:
+                with open(ojp, 'r', encoding='utf-8') as f:
+                    data = json.load(f)
+                    vaults = data.get('vaults', {})
+                    if isinstance(vaults, dict):
+                        for v_id, v_info in vaults.items():
+                            v_path = v_info.get('path')
+                            if v_path:
+                                obs_folder = os.path.join(v_path, '.obsidian')
+                                if os.path.isdir(obs_folder):
+                                    vault_dirs.add(obs_folder)
+            except Exception: pass
+
+    # Apply quickshell-theme.css and update appearance.json to enable the snippet automatically
+    for obs_dir in vault_dirs:
+        try:
+            snippets_dir = os.path.join(obs_dir, 'snippets')
+            os.makedirs(snippets_dir, exist_ok=True)
+
+            css_path = os.path.join(snippets_dir, 'quickshell-theme.css')
+            with open(css_path, 'w', encoding='utf-8') as f:
+                f.write(obsidian_css)
+
+            app_file = os.path.join(obs_dir, 'appearance.json')
+            app_data = {}
+            if os.path.exists(app_file):
+                try:
+                    with open(app_file, 'r', encoding='utf-8') as f:
+                        app_data = json.load(f)
+                except Exception:
+                    app_data = {}
+
+            enabled_snippets = app_data.get('enabledCssSnippets', [])
+            if not isinstance(enabled_snippets, list):
+                enabled_snippets = []
+
+            if 'quickshell-theme' not in enabled_snippets:
+                enabled_snippets.append('quickshell-theme')
+                app_data['enabledCssSnippets'] = enabled_snippets
+
+            app_data['baseOption'] = 'dark' if is_dark else 'light'
+
+            with open(app_file, 'w', encoding='utf-8') as f:
+                json.dump(app_data, f, indent=2)
+        except Exception: pass
+
 def main():
     parser = argparse.ArgumentParser()
     parser.add_argument('--bg', required=True)
@@ -1472,6 +1607,7 @@ def main():
     sync_vscode(args.bg, args.surface, args.currentLine, args.fg, args.accent, args.subAccent, is_dark)
     sync_zen(args.bg, args.surface, args.currentLine, args.fg, args.accent, args.subAccent, is_dark)
     sync_feishin(args.bg, args.surface, args.currentLine, args.fg, args.accent, args.subAccent, is_dark, args.variantName)
+    sync_obsidian(args.bg, args.surface, args.currentLine, args.fg, args.accent, args.subAccent, is_dark)
     sync_starship(args.bg, args.surface, args.currentLine, args.fg, args.accent, args.subAccent, is_dark)
     sync_vim(args.bg, args.surface, args.currentLine, args.fg, args.accent, args.subAccent, is_dark)
     sync_btop(args.bg, args.surface, args.currentLine, args.fg, args.accent, args.subAccent)
@@ -1483,4 +1619,3 @@ def main():
 
 if __name__ == '__main__':
     main()
-