diff --git a/dev-packages/browser-integration-tests/suites/tracing/microfrontend-span-attribution/init.js b/dev-packages/browser-integration-tests/suites/tracing/microfrontend-span-attribution/init.js
new file mode 100644
index 000000000000..b8f186bc2896
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/tracing/microfrontend-span-attribution/init.js
@@ -0,0 +1,22 @@
+import * as Sentry from '@sentry/browser';
+
+window.Sentry = Sentry;
+
+Sentry.init({
+  dsn: 'https://public@dsn.ingest.sentry.io/1337',
+  integrations: [Sentry.browserTracingIntegration()],
+  tracePropagationTargets: ['http://sentry-test-site.example'],
+  tracesSampleRate: 1,
+  autoSessionTracking: false,
+});
+
+// Propagate MFE identity from current scope to span attributes.
+// withScope() forks the current scope, so tags set on the fork are
+// visible when fetch/XHR instrumentation creates spans synchronously.
+const client = Sentry.getClient();
+client.on('spanStart', span => {
+  const mfeName = Sentry.getCurrentScope().getScopeData().tags['mfe.name'];
+  if (mfeName) {
+    span.setAttribute('mfe.name', mfeName);
+  }
+});
diff --git a/dev-packages/browser-integration-tests/suites/tracing/microfrontend-span-attribution/mfe-header.js b/dev-packages/browser-integration-tests/suites/tracing/microfrontend-span-attribution/mfe-header.js
new file mode 100644
index 000000000000..16bfecfd15eb
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/tracing/microfrontend-span-attribution/mfe-header.js
@@ -0,0 +1,8 @@
+import * as Sentry from '@sentry/browser';
+
+export function mount() {
+  Sentry.withScope(scope => {
+    scope.setTag('mfe.name', 'mfe-header');
+    fetch('http://sentry-test-site.example/api/todos/1');
+  });
+}
diff --git a/dev-packages/browser-integration-tests/suites/tracing/microfrontend-span-attribution/mfe-one.js b/dev-packages/browser-integration-tests/suites/tracing/microfrontend-span-attribution/mfe-one.js
new file mode 100644
index 000000000000..fdd091af4801
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/tracing/microfrontend-span-attribution/mfe-one.js
@@ -0,0 +1,8 @@
+import * as Sentry from '@sentry/browser';
+
+export function mount() {
+  Sentry.withScope(scope => {
+    scope.setTag('mfe.name', 'mfe-one');
+    fetch('http://sentry-test-site.example/api/todos/2');
+  });
+}
diff --git a/dev-packages/browser-integration-tests/suites/tracing/microfrontend-span-attribution/mfe-two.js b/dev-packages/browser-integration-tests/suites/tracing/microfrontend-span-attribution/mfe-two.js
new file mode 100644
index 000000000000..ff6c23d374e0
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/tracing/microfrontend-span-attribution/mfe-two.js
@@ -0,0 +1,8 @@
+import * as Sentry from '@sentry/browser';
+
+export function mount() {
+  Sentry.withScope(scope => {
+    scope.setTag('mfe.name', 'mfe-two');
+    fetch('http://sentry-test-site.example/api/todos/3');
+  });
+}
diff --git a/dev-packages/browser-integration-tests/suites/tracing/microfrontend-span-attribution/subject.js b/dev-packages/browser-integration-tests/suites/tracing/microfrontend-span-attribution/subject.js
new file mode 100644
index 000000000000..b36ad956e913
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/tracing/microfrontend-span-attribution/subject.js
@@ -0,0 +1,9 @@
+// Simulates a microfrontend architecture where MFEs are lazy-loaded
+
+// Lazy-load each MFE (kinda like React.lazy + Module Federation)
+import('./mfe-header').then(m => m.mount());
+import('./mfe-one').then(m => m.mount());
+import('./mfe-two').then(m => m.mount());
+
+// Shell makes its own request, no MFE scope
+fetch('http://sentry-test-site.example/api/shell-config');
diff --git a/dev-packages/browser-integration-tests/suites/tracing/microfrontend-span-attribution/template.html b/dev-packages/browser-integration-tests/suites/tracing/microfrontend-span-attribution/template.html
new file mode 100644
index 000000000000..acc42eb2480f
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/tracing/microfrontend-span-attribution/template.html
@@ -0,0 +1,9 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+  </head>
+  <body>
+    <div id="root"></div>
+  </body>
+</html>
diff --git a/dev-packages/browser-integration-tests/suites/tracing/microfrontend-span-attribution/test.ts b/dev-packages/browser-integration-tests/suites/tracing/microfrontend-span-attribution/test.ts
new file mode 100644
index 000000000000..e49b258b4ff2
--- /dev/null
+++ b/dev-packages/browser-integration-tests/suites/tracing/microfrontend-span-attribution/test.ts
@@ -0,0 +1,37 @@
+import { expect } from '@playwright/test';
+import { sentryTest } from '../../../utils/fixtures';
+import { envelopeRequestParser, shouldSkipTracingTest, waitForTransactionRequest } from '../../../utils/helpers';
+
+sentryTest('should attribute spans to their originating microfrontend', async ({ getLocalTestUrl, page }) => {
+  if (shouldSkipTracingTest()) {
+    sentryTest.skip();
+  }
+
+  await page.route('http://sentry-test-site.example/*', route => route.fulfill({ body: '{}' }));
+
+  const url = await getLocalTestUrl({ testDir: __dirname });
+
+  const reqPromise = waitForTransactionRequest(page, event => {
+    const spans = event.spans || [];
+    return (
+      spans.some(s => s.description?.includes('/api/todos/1')) &&
+      spans.some(s => s.description?.includes('/api/todos/2')) &&
+      spans.some(s => s.description?.includes('/api/todos/3')) &&
+      spans.some(s => s.description?.includes('/api/shell-config'))
+    );
+  });
+
+  await page.goto(url);
+
+  const req = await reqPromise;
+  const event = envelopeRequestParser(req);
+  const httpSpans = event.spans?.filter(({ op }) => op === 'http.client') || [];
+
+  // Each MFE's fetch is attributed via withScope + spanStart hook
+  expect(httpSpans.find(s => s.description?.includes('/api/todos/1'))?.data?.['mfe.name']).toBe('mfe-header');
+  expect(httpSpans.find(s => s.description?.includes('/api/todos/2'))?.data?.['mfe.name']).toBe('mfe-one');
+  expect(httpSpans.find(s => s.description?.includes('/api/todos/3'))?.data?.['mfe.name']).toBe('mfe-two');
+
+  // Shell span has no MFE tag
+  expect(httpSpans.find(s => s.description?.includes('/api/shell-config'))?.data?.['mfe.name']).toBeUndefined();
+});