diff --git a/packages/types/src/provider-settings.ts b/packages/types/src/provider-settings.ts
index e940ececd1..70fbc98587 100644
--- a/packages/types/src/provider-settings.ts
+++ b/packages/types/src/provider-settings.ts
@@ -161,6 +161,7 @@ const geminiSchema = apiModelIdProviderModelSchema.extend({
 
 const geminiCliSchema = apiModelIdProviderModelSchema.extend({
 	geminiCliOAuthPath: z.string().optional(),
+	geminiCliDefaultProject: z.string().optional(),
 	geminiCliProjectId: z.string().optional(),
 })
 
diff --git a/src/api/providers/gemini-cli.ts b/src/api/providers/gemini-cli.ts
index 6e265511e4..f11ef2aebb 100644
--- a/src/api/providers/gemini-cli.ts
+++ b/src/api/providers/gemini-cli.ts
@@ -140,7 +140,7 @@ export class GeminiCliHandler extends BaseProvider implements SingleCompletionHa
 		}
 
 		// Start with a default project ID (can be anything for personal OAuth)
-		const initialProjectId = "default"
+		const initialProjectId = this.options.geminiCliDefaultProject || "default"
 
 		// Prepare client metadata
 		const clientMetadata = {
diff --git a/webview-ui/src/components/settings/providers/GeminiCli.tsx b/webview-ui/src/components/settings/providers/GeminiCli.tsx
index 9c1654e4bb..04e052e566 100644
--- a/webview-ui/src/components/settings/providers/GeminiCli.tsx
+++ b/webview-ui/src/components/settings/providers/GeminiCli.tsx
@@ -40,6 +40,18 @@ export const GeminiCli = ({ apiConfiguration, setApiConfigurationField }: Gemini
 				{t("settings:providers.geminiCli.oauthPathDescription")}
 			</div>
 
+			<VSCodeTextField
+				value={apiConfiguration?.geminiCliDefaultProject || ""}
+				onInput={handleInputChange("geminiCliDefaultProject")}
+				placeholder="default"
+				className="w-full">
+				<label className="block font-medium mb-1">{t("settings:providers.geminiCli.defaultProject")}</label>
+			</VSCodeTextField>
+
+			<div className="text-sm text-vscode-descriptionForeground -mt-2">
+				{t("settings:providers.geminiCli.defaultProjectDescription")}
+			</div>
+
 			<div className="text-sm text-vscode-descriptionForeground mt-3">
 				{t("settings:providers.geminiCli.description")}
 			</div>
diff --git a/webview-ui/src/i18n/locales/en/settings.json b/webview-ui/src/i18n/locales/en/settings.json
index 9083d4a204..ae6b482b62 100644
--- a/webview-ui/src/i18n/locales/en/settings.json
+++ b/webview-ui/src/i18n/locales/en/settings.json
@@ -311,6 +311,8 @@
 		},
 		"geminiCli": {
 			"description": "This provider uses OAuth authentication from the Gemini CLI tool and does not require API keys.",
+			"defaultProject": "Default Project (optional)",
+			"defaultProjectDescription": "Default Google Cloud Project Name (For paid Gemini Code Assist tiers, see https://github.com/google-gemini/gemini-cli/blob/main/docs/cli/authentication.md)",
 			"oauthPath": "OAuth Credentials Path (optional)",
 			"oauthPathDescription": "Path to the OAuth credentials file. Leave empty to use the default location (~/.gemini/oauth_creds.json).",
 			"instructions": "If you haven't authenticated yet, please run",