diff --git a/code/core/src/bin/core.ts b/code/core/src/bin/core.ts
index 9ce0413d9bcb..2a61d3753c2a 100644
--- a/code/core/src/bin/core.ts
+++ b/code/core/src/bin/core.ts
@@ -97,6 +97,7 @@ command('dev')
   .option('--smoke-test', 'Exit after successful start')
   .option('--ci', "CI mode (skip interactive prompts, don't open browser)")
   .option('--no-open', 'Do not open Storybook automatically in the browser')
+  .option('--open-url <url>', 'Open a custom URL instead of the default local address')
   .option('--quiet', 'Suppress verbose build output')
   .option('--no-version-updates', 'Suppress update check', true)
   .option('--debug-webpack', 'Display final webpack configurations for debugging purposes')
@@ -134,6 +135,10 @@ command('dev')
       ci: 'CI',
     });
 
+    if (!options.openUrl && process.env.STORYBOOK_OPEN_URL) {
+      options.openUrl = process.env.STORYBOOK_OPEN_URL;
+    }
+
     if (parseInt(`${options.port}`, 10)) {
       options.port = parseInt(`${options.port}`, 10);
     }
diff --git a/code/core/src/core-server/dev-server.ts b/code/core/src/core-server/dev-server.ts
index 1841a15c4b02..2051b7db853e 100644
--- a/code/core/src/core-server/dev-server.ts
+++ b/code/core/src/core-server/dev-server.ts
@@ -186,9 +186,15 @@ export async function storybookDevServer(
     const [indexGenerator] = await Promise.all([storyIndexGeneratorPromise, listening]);
 
     if (indexGenerator && !options.ci && !options.smokeTest && options.open) {
-      const url = options.host ? options.networkAddress : options.localAddress;
-      openInBrowser(options.previewOnly ? `${url}iframe.html?navigator=true` : url!).catch(() => {
-        // the browser window could not be opened, this is non-critical, we just ignore the error
+      const defaultUrl = options.host ? options.networkAddress : options.localAddress;
+      const url =
+        options.openUrl ||
+        (options.previewOnly ? `${defaultUrl}iframe.html?navigator=true` : defaultUrl!);
+      // the browser window could not be opened, this is non-critical, we just ignore the error
+      openInBrowser(url).catch((err: Error) => {
+        if (options.openUrl) {
+          logger.warn(`Failed to open custom URL: ${url}\n  ${err.message}`);
+        }
       });
     }
   } catch (e) {
diff --git a/code/core/src/types/modules/core-common.ts b/code/core/src/types/modules/core-common.ts
index f1ed67e754f9..47b412d54aa8 100644
--- a/code/core/src/types/modules/core-common.ts
+++ b/code/core/src/types/modules/core-common.ts
@@ -196,6 +196,7 @@ export interface CLIOptions extends CLIBaseOptions {
   smokeTest?: boolean;
   managerCache?: boolean;
   open?: boolean;
+  openUrl?: string;
   ci?: boolean;
   versionUpdates?: boolean;
   docs?: boolean;
diff --git a/docs/api/cli-options.mdx b/docs/api/cli-options.mdx
index 64d1830b5421..9bc9cd44b83e 100644
--- a/docs/api/cli-options.mdx
+++ b/docs/api/cli-options.mdx
@@ -53,6 +53,7 @@ Options include:
 | `--smoke-test`                  | Exit after successful start.<br />`storybook dev --smoke-test`                                                                                                                                                                                      |
 | `--ci`                          | CI mode (skip interactive prompts, don't open browser).<br />`storybook dev --ci`                                                                                                                                                                   |
 | `--no-open`                     | Do not open Storybook automatically in the browser.<br />`storybook dev --no-open`                                                                                                                                                                  |
+| `--open-url <url>`              | Open a custom URL instead of the default local address. Useful when running a local HTTPS reverse proxy. Can also be set via the `STORYBOOK_OPEN_URL` environment variable (CLI flag takes precedence). Note: `--no-open` disables opening entirely and overrides both `--open-url` and the environment variable.<br />`storybook dev --open-url https://myapp.localhost` |
 | `--quiet`                       | Suppress verbose build output.<br />`storybook dev --quiet`                                                                                                                                                                                         |
 | `--debug`                       | Outputs more logs in the CLI to assist debugging.<br />`storybook dev --debug`                                                                                                                                                                      |
 | `--debug-webpack`               | Display final webpack configurations for debugging purposes.<br />`storybook dev --debug-webpack`                                                                                                                                                   |