diff --git a/app/controllers/crate/settings/new-trusted-publisher.js b/app/controllers/crate/settings/new-trusted-publisher.js
index 2231c9b0534..f236f6f0443 100644
--- a/app/controllers/crate/settings/new-trusted-publisher.js
+++ b/app/controllers/crate/settings/new-trusted-publisher.js
@@ -2,8 +2,9 @@ import Controller from '@ember/controller';
 import { action } from '@ember/object';
 import { service } from '@ember/service';
 import { tracked } from '@glimmer/tracking';
+import Ember from 'ember';
 
-import { task } from 'ember-concurrency';
+import { rawTimeout, restartableTask, task } from 'ember-concurrency';
 
 export default class NewTrustedPublisherController extends Controller {
   @service notifications;
@@ -33,6 +34,34 @@ export default class NewTrustedPublisherController extends Controller {
     }
   }
 
+  get verificationUrl() {
+    if (this.repositoryOwner && this.repositoryName && this.workflowFilename) {
+      return `https://raw.githubusercontent.com/${this.repositoryOwner}/${this.repositoryName}/HEAD/.github/workflows/${this.workflowFilename}`;
+    }
+  }
+
+  verifyWorkflowTask = restartableTask(async () => {
+    let timeout = Ember.testing ? 0 : 500;
+    await rawTimeout(timeout);
+
+    let { verificationUrl } = this;
+    if (!verificationUrl) return null;
+
+    try {
+      let response = await fetch(verificationUrl, { method: 'HEAD' });
+
+      if (response.ok) {
+        return 'success';
+      } else if (response.status === 404) {
+        return 'not-found';
+      } else {
+        return 'error';
+      }
+    } catch {
+      return 'error';
+    }
+  });
+
   saveConfigTask = task(async () => {
     if (!this.validate()) return;
 
diff --git a/app/templates/crate/settings/new-trusted-publisher.css b/app/templates/crate/settings/new-trusted-publisher.css
index 020fddccf53..fb54ba322ce 100644
--- a/app/templates/crate/settings/new-trusted-publisher.css
+++ b/app/templates/crate/settings/new-trusted-publisher.css
@@ -45,3 +45,20 @@
 .cancel-button {
     border-radius: 4px;
 }
+
+.workflow-verification {
+    margin-top: var(--space-2xs);
+    font-size: 0.85em;
+
+    :global(a), :global(a):hover {
+        color: inherit;
+    }
+}
+
+.workflow-verification--success {
+    color: var(--green800);
+}
+
+.workflow-verification--warning {
+    color: var(--yellow700);
+}
diff --git a/app/templates/crate/settings/new-trusted-publisher.gjs b/app/templates/crate/settings/new-trusted-publisher.gjs
index 18f92053cb7..b6e85c97f5b 100644
--- a/app/templates/crate/settings/new-trusted-publisher.gjs
+++ b/app/templates/crate/settings/new-trusted-publisher.gjs
@@ -7,6 +7,7 @@ import autoFocus from '@zestia/ember-auto-focus/modifiers/auto-focus';
 import perform from 'ember-concurrency/helpers/perform';
 import preventDefault from 'ember-event-helpers/helpers/prevent-default';
 import eq from 'ember-truth-helpers/helpers/eq';
+import not from 'ember-truth-helpers/helpers/not';
 
 import LoadingSpinner from 'crates-io/components/loading-spinner';
 
@@ -51,6 +52,7 @@ import LoadingSpinner from 'crates-io/components/loading-spinner';
             data-test-repository-owner
             {{autoFocus}}
             {{on 'input' @controller.resetRepositoryOwnerValidation}}
+            {{on 'input' (perform @controller.verifyWorkflowTask)}}
           />
 
           {{#if @controller.repositoryOwnerInvalid}}
@@ -79,6 +81,7 @@ import LoadingSpinner from 'crates-io/components/loading-spinner';
             class='input base-input'
             data-test-repository-name
             {{on 'input' @controller.resetRepositoryNameValidation}}
+            {{on 'input' (perform @controller.verifyWorkflowTask)}}
           />
 
           {{#if @controller.repositoryNameInvalid}}
@@ -107,6 +110,7 @@ import LoadingSpinner from 'crates-io/components/loading-spinner';
             class='input base-input'
             data-test-workflow-filename
             {{on 'input' @controller.resetWorkflowFilenameValidation}}
+            {{on 'input' (perform @controller.verifyWorkflowTask)}}
           />
 
           {{#if @controller.workflowFilenameInvalid}}
@@ -140,6 +144,41 @@ import LoadingSpinner from 'crates-io/components/loading-spinner';
               <code>publish.yml</code>.
             </div>
           {{/if}}
+
+          {{#if (not @controller.verificationUrl)}}
+            <div class='workflow-verification' data-test-workflow-verification='initial'>
+              The workflow filename will be verified once all necessary fields are filled.
+            </div>
+          {{else if (eq @controller.verifyWorkflowTask.last.value 'success')}}
+            <div class='workflow-verification workflow-verification--success' data-test-workflow-verification='success'>
+              ✓ Workflow file found at
+              <a href='{{@controller.verificationUrl}}' target='_blank' rel='noopener noreferrer'>
+                {{@controller.verificationUrl}}
+              </a>
+            </div>
+          {{else if (eq @controller.verifyWorkflowTask.last.value 'not-found')}}
+            <div
+              class='workflow-verification workflow-verification--warning'
+              data-test-workflow-verification='not-found'
+            >
+              ⚠ Workflow file not found at
+              <a href='{{@controller.verificationUrl}}' target='_blank' rel='noopener noreferrer'>
+                {{@controller.verificationUrl}}
+              </a>
+            </div>
+          {{else if (eq @controller.verifyWorkflowTask.last.value 'error')}}
+            <div class='workflow-verification workflow-verification--warning' data-test-workflow-verification='error'>
+              ⚠ Could not verify workflow file at
+              <a href='{{@controller.verificationUrl}}' target='_blank' rel='noopener noreferrer'>
+                {{@controller.verificationUrl}}
+              </a>
+              (network error)
+            </div>
+          {{else}}
+            <div class='workflow-verification' data-test-workflow-verification='verifying'>
+              Verifying...
+            </div>
+          {{/if}}
         {{/let}}
       </div>
 
diff --git a/e2e/routes/crate/settings/new-trusted-publisher.spec.ts b/e2e/routes/crate/settings/new-trusted-publisher.spec.ts
index d69fcf81b0d..78c90e30dc7 100644
--- a/e2e/routes/crate/settings/new-trusted-publisher.spec.ts
+++ b/e2e/routes/crate/settings/new-trusted-publisher.spec.ts
@@ -245,4 +245,77 @@ test.describe('Route | crate.settings.new-trusted-publisher', { tag: '@routes' }
       });
     }
   });
+
+  test.describe('workflow verification', () => {
+    test('success case (200 OK)', async ({ msw, page }) => {
+      let { crate } = await prepare(msw);
+
+      await page.goto(`/crates/${crate.name}/settings/new-trusted-publisher`);
+      await expect(page).toHaveURL(`/crates/${crate.name}/settings/new-trusted-publisher`);
+
+      await msw.worker.use(
+        http.head('https://raw.githubusercontent.com/rust-lang/crates.io/HEAD/.github/workflows/ci.yml', () => {
+          return new HttpResponse(null, { status: 200 });
+        }),
+      );
+
+      await expect(page.locator('[data-test-workflow-verification="initial"]')).toHaveText(
+        'The workflow filename will be verified once all necessary fields are filled.',
+      );
+
+      await page.fill('[data-test-repository-owner]', 'rust-lang');
+      await page.fill('[data-test-repository-name]', 'crates.io');
+      await page.fill('[data-test-workflow-filename]', 'ci.yml');
+
+      await expect(page.locator('[data-test-workflow-verification="success"]')).toHaveText(
+        '✓ Workflow file found at https://raw.githubusercontent.com/rust-lang/crates.io/HEAD/.github/workflows/ci.yml',
+      );
+    });
+
+    test('not found case (404)', async ({ msw, page }) => {
+      let { crate } = await prepare(msw);
+
+      await page.goto(`/crates/${crate.name}/settings/new-trusted-publisher`);
+      await expect(page).toHaveURL(`/crates/${crate.name}/settings/new-trusted-publisher`);
+
+      await msw.worker.use(
+        http.head('https://raw.githubusercontent.com/rust-lang/crates.io/HEAD/.github/workflows/missing.yml', () => {
+          return new HttpResponse(null, { status: 404 });
+        }),
+      );
+
+      await page.fill('[data-test-repository-owner]', 'rust-lang');
+      await page.fill('[data-test-repository-name]', 'crates.io');
+      await page.fill('[data-test-workflow-filename]', 'missing.yml');
+
+      await expect(page.locator('[data-test-workflow-verification="not-found"]')).toHaveText(
+        '⚠ Workflow file not found at https://raw.githubusercontent.com/rust-lang/crates.io/HEAD/.github/workflows/missing.yml',
+      );
+
+      // Verify form can still be submitted
+      await page.click('[data-test-add]');
+      await expect(page).toHaveURL(`/crates/${crate.name}/settings`);
+    });
+
+    test('server error (5xx)', async ({ msw, page }) => {
+      let { crate } = await prepare(msw);
+
+      await page.goto(`/crates/${crate.name}/settings/new-trusted-publisher`);
+      await expect(page).toHaveURL(`/crates/${crate.name}/settings/new-trusted-publisher`);
+
+      await msw.worker.use(
+        http.head('https://raw.githubusercontent.com/rust-lang/crates.io/HEAD/.github/workflows/ci.yml', () => {
+          return new HttpResponse(null, { status: 500 });
+        }),
+      );
+
+      await page.fill('[data-test-repository-owner]', 'rust-lang');
+      await page.fill('[data-test-repository-name]', 'crates.io');
+      await page.fill('[data-test-workflow-filename]', 'ci.yml');
+
+      await expect(page.locator('[data-test-workflow-verification="error"]')).toHaveText(
+        '⚠ Could not verify workflow file at https://raw.githubusercontent.com/rust-lang/crates.io/HEAD/.github/workflows/ci.yml (network error)',
+      );
+    });
+  });
 });
diff --git a/packages/crates-io-msw/handlers/github.js b/packages/crates-io-msw/handlers/github.js
new file mode 100644
index 00000000000..0901e5a6a42
--- /dev/null
+++ b/packages/crates-io-msw/handlers/github.js
@@ -0,0 +1,7 @@
+import { http, HttpResponse } from 'msw';
+
+export default [
+  http.head('https://raw.githubusercontent.com/:owner/:projec/HEAD/.github/workflows/:workflow_filename', () => {
+    return new HttpResponse(null, { status: 404 });
+  }),
+];
diff --git a/packages/crates-io-msw/index.js b/packages/crates-io-msw/index.js
index 5973d4bb81a..4c4d65a6e6d 100644
--- a/packages/crates-io-msw/index.js
+++ b/packages/crates-io-msw/index.js
@@ -2,6 +2,7 @@ import apiTokenHandlers from './handlers/api-tokens.js';
 import categoryHandlers from './handlers/categories.js';
 import cratesHandlers from './handlers/crates.js';
 import docsRsHandlers from './handlers/docs-rs.js';
+import githubHandlers from './handlers/github.js';
 import inviteHandlers from './handlers/invites.js';
 import keywordHandlers from './handlers/keywords.js';
 import metadataHandlers from './handlers/metadata.js';
@@ -32,6 +33,7 @@ export const handlers = [
   ...categoryHandlers,
   ...cratesHandlers,
   ...docsRsHandlers,
+  ...githubHandlers,
   ...inviteHandlers,
   ...keywordHandlers,
   ...metadataHandlers,
diff --git a/tests/routes/crate/settings/new-trusted-publisher-test.js b/tests/routes/crate/settings/new-trusted-publisher-test.js
index 157231163ae..7c7adbfe8f2 100644
--- a/tests/routes/crate/settings/new-trusted-publisher-test.js
+++ b/tests/routes/crate/settings/new-trusted-publisher-test.js
@@ -252,4 +252,83 @@ module('Route | crate.settings.new-trusted-publisher', hooks => {
       });
     }
   });
+
+  module('workflow verification', function () {
+    test('success case (200 OK)', async function (assert) {
+      let { crate } = prepare(this);
+
+      await visit(`/crates/${crate.name}/settings/new-trusted-publisher`);
+      assert.strictEqual(currentURL(), `/crates/${crate.name}/settings/new-trusted-publisher`);
+
+      this.worker.use(
+        http.head('https://raw.githubusercontent.com/rust-lang/crates.io/HEAD/.github/workflows/ci.yml', () => {
+          return new HttpResponse(null, { status: 200 });
+        }),
+      );
+
+      assert
+        .dom('[data-test-workflow-verification="initial"]')
+        .hasText('The workflow filename will be verified once all necessary fields are filled.');
+
+      await fillIn('[data-test-repository-owner]', 'rust-lang');
+      await fillIn('[data-test-repository-name]', 'crates.io');
+      await fillIn('[data-test-workflow-filename]', 'ci.yml');
+
+      await waitFor('[data-test-workflow-verification="success"]');
+
+      let expected =
+        '✓ Workflow file found at https://raw.githubusercontent.com/rust-lang/crates.io/HEAD/.github/workflows/ci.yml';
+      assert.dom('[data-test-workflow-verification="success"]').hasText(expected);
+    });
+
+    test('not found case (404)', async function (assert) {
+      let { crate } = prepare(this);
+
+      await visit(`/crates/${crate.name}/settings/new-trusted-publisher`);
+      assert.strictEqual(currentURL(), `/crates/${crate.name}/settings/new-trusted-publisher`);
+
+      this.worker.use(
+        http.head('https://raw.githubusercontent.com/rust-lang/crates.io/HEAD/.github/workflows/missing.yml', () => {
+          return new HttpResponse(null, { status: 404 });
+        }),
+      );
+
+      await fillIn('[data-test-repository-owner]', 'rust-lang');
+      await fillIn('[data-test-repository-name]', 'crates.io');
+      await fillIn('[data-test-workflow-filename]', 'missing.yml');
+
+      await waitFor('[data-test-workflow-verification="not-found"]');
+
+      let expected =
+        '⚠ Workflow file not found at https://raw.githubusercontent.com/rust-lang/crates.io/HEAD/.github/workflows/missing.yml';
+      assert.dom('[data-test-workflow-verification="not-found"]').hasText(expected);
+
+      // Verify form can still be submitted
+      await click('[data-test-add]');
+      assert.strictEqual(currentURL(), `/crates/${crate.name}/settings`);
+    });
+
+    test('server error (5xx)', async function (assert) {
+      let { crate } = prepare(this);
+
+      await visit(`/crates/${crate.name}/settings/new-trusted-publisher`);
+      assert.strictEqual(currentURL(), `/crates/${crate.name}/settings/new-trusted-publisher`);
+
+      this.worker.use(
+        http.head('https://raw.githubusercontent.com/rust-lang/crates.io/HEAD/.github/workflows/ci.yml', () => {
+          return new HttpResponse(null, { status: 500 });
+        }),
+      );
+
+      await fillIn('[data-test-repository-owner]', 'rust-lang');
+      await fillIn('[data-test-repository-name]', 'crates.io');
+      await fillIn('[data-test-workflow-filename]', 'ci.yml');
+
+      await waitFor('[data-test-workflow-verification="error"]');
+
+      let expected =
+        '⚠ Could not verify workflow file at https://raw.githubusercontent.com/rust-lang/crates.io/HEAD/.github/workflows/ci.yml (network error)';
+      assert.dom('[data-test-workflow-verification="error"]').hasText(expected);
+    });
+  });
 });