diff --git a/e2e-tests/playwright/support/ui/components/channels/message_priority.ts b/e2e-tests/playwright/support/ui/components/channels/message_priority.ts
new file mode 100644
index 0000000000..90f48c0f91
--- /dev/null
+++ b/e2e-tests/playwright/support/ui/components/channels/message_priority.ts
@@ -0,0 +1,78 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import {expect, Locator} from '@playwright/test';
+
+export default class MessagePriority {
+    readonly container: Locator;
+    readonly priorityIcon: Locator;
+    readonly priorityMenu: Locator;
+    readonly standardPriorityOption: Locator;
+    readonly priorityDialog: Locator;
+    readonly dialogHeader: Locator;
+
+    constructor(container: Locator) {
+        this.container = container;
+
+        // Formatting bar priority icon
+        this.priorityIcon = container.locator('#messagePriority');
+
+        // Priority menu that opens when clicking the icon
+        this.priorityMenu = container.locator('[role="menu"]').filter({hasText: /Message Priority/});
+
+        // Standard priority option in the menu (id comes from webapp implementation)
+        this.standardPriorityOption = this.priorityMenu.locator('#menu-item-priority-standard');
+
+        // Priority dialog elements
+        this.priorityDialog = container.page().getByRole('dialog');
+        this.dialogHeader = this.priorityDialog.locator('h4.modal-title');
+    }
+
+    async clickPriorityIcon() {
+        await this.priorityIcon.waitFor({state: 'visible'});
+        await this.priorityIcon.click();
+    }
+
+    async verifyPriorityIconVisible() {
+        await this.priorityIcon.waitFor({state: 'visible'});
+        await expect(this.priorityIcon).toBeVisible();
+    }
+
+    async verifyStandardPrioritySelected() {
+        await expect(this.priorityMenu).toBeVisible();
+        await expect(this.standardPriorityOption).toHaveAttribute('aria-checked', 'true');
+    }
+
+    async verifyPriorityMenuVisible() {
+        await expect(this.priorityMenu).toBeVisible();
+        // Look for beta text in header
+        await expect(this.priorityMenu.locator('text=Message Priority')).toBeVisible();
+    }
+
+    async closePriorityMenu() {
+        await this.priorityIcon.click();
+        await expect(this.priorityMenu).not.toBeVisible();
+    }
+
+    async verifyNoPriorityLabel(postText: string) {
+        const post = this.container.locator(`text=${postText}`);
+        await expect(post).toBeVisible();
+
+        // Verify no priority label exists
+        const priorityLabel = post.locator('[data-testid="post-priority-label"]');
+        await expect(priorityLabel).toHaveCount(0);
+    }
+
+    async verifyPriorityDialog() {
+        await expect(this.priorityDialog).toBeVisible();
+        await expect(this.dialogHeader).toHaveText('Message priority');
+    }
+
+    async verifyStandardOptionSelected() {
+        const standardOption = this.priorityDialog.getByRole('menuitem', {name: 'Standard'});
+        await expect(standardOption).toBeVisible();
+        await expect(standardOption.locator('svg.StyledCheckIcon-dFKfoY')).toBeVisible();
+    }
+}
+
+export {MessagePriority};
diff --git a/e2e-tests/playwright/support/ui/components/channels/post_create.ts b/e2e-tests/playwright/support/ui/components/channels/post_create.ts
index f16cd2060a..009494feea 100644
--- a/e2e-tests/playwright/support/ui/components/channels/post_create.ts
+++ b/e2e-tests/playwright/support/ui/components/channels/post_create.ts
@@ -11,6 +11,7 @@ export default class ChannelsPostCreate {
     readonly emojiButton;
     readonly sendMessageButton;
     readonly scheduleDraftMessageButton;
+    readonly priorityButton;
     readonly suggestionList;
 
     constructor(container: Locator, isRHS = false) {
@@ -26,6 +27,7 @@ export default class ChannelsPostCreate {
         this.emojiButton = container.getByLabel('select an emoji');
         this.sendMessageButton = container.getByTestId('SendMessageButton');
         this.scheduleDraftMessageButton = container.getByLabel('Schedule message');
+        this.priorityButton = container.getByLabel('Message priority');
         this.suggestionList = container.getByTestId('suggestionList');
     }
 
@@ -81,6 +83,15 @@ export default class ChannelsPostCreate {
         await this.scheduleDraftMessageButton.click();
     }
 
+    /**
+     * Opens the message priority menu
+     */
+    async openPriorityMenu() {
+        await expect(this.priorityButton).toBeVisible();
+        await expect(this.priorityButton).toBeEnabled();
+        await this.priorityButton.click();
+    }
+
     /**
      * Composes and sends a message
      */
diff --git a/e2e-tests/playwright/support/ui/components/index.ts b/e2e-tests/playwright/support/ui/components/index.ts
index 1e48cd79ba..1f7c2375a5 100644
--- a/e2e-tests/playwright/support/ui/components/index.ts
+++ b/e2e-tests/playwright/support/ui/components/index.ts
@@ -21,6 +21,7 @@ import {PostMenu} from './channels/post_menu';
 import {ThreadFooter} from './channels/thread_footer';
 import {EmojiGifPicker} from './channels/emoji_gif_picker';
 import {GenericConfirmModal} from './channels/generic_confirm_modal';
+import {MessagePriority} from './channels/message_priority';
 
 import {ScheduledDraftMenu} from './channels/scheduled_draft_menu';
 import {ScheduledDraftModal} from './channels/scheduled_draft_modal';
@@ -62,6 +63,7 @@ const components = {
     SystemUsersFilterPopover,
     SystemUsersFilterMenu,
     SystemUsersColumnToggleMenu,
+    MessagePriority,
     UserProfilePopover,
 };
 
@@ -80,4 +82,5 @@ export {
     PostDotMenu,
     PostMenu,
     ThreadFooter,
+    MessagePriority,
 };
diff --git a/e2e-tests/playwright/tests/functional/channels/message_priority/standard_priority.spec.ts b/e2e-tests/playwright/tests/functional/channels/message_priority/standard_priority.spec.ts
new file mode 100644
index 0000000000..9d76d43e01
--- /dev/null
+++ b/e2e-tests/playwright/tests/functional/channels/message_priority/standard_priority.spec.ts
@@ -0,0 +1,51 @@
+// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
+// See LICENSE.txt for license information.
+
+import {expect, test} from '@e2e-support/test_fixture';
+import MessagePriority from '@e2e-support/ui/components/channels/message_priority';
+
+test('MM-T5139: Message Priority - Standard message priority and system setting', async ({pw, pages}) => {
+    // # Setup test environment
+    const {user} = await pw.initSetup();
+
+    // # Log in as a user in new browser context
+    const {page} = await pw.testBrowser.login(user);
+
+    // # Visit default channel page
+    const channelPage = new pages.ChannelsPage(page);
+    await channelPage.goto();
+    await channelPage.toBeVisible();
+
+    const messagePriority = new MessagePriority(page.locator('body'));
+
+    // Open menu
+    await channelPage.centerView.postCreate.openPriorityMenu();
+
+    // Use messagePriority for dialog interactions
+    await messagePriority.verifyPriorityDialog();
+    await messagePriority.verifyStandardOptionSelected();
+
+    // # Close menu and post message
+    await channelPage.centerView.postCreate.priorityButton.click();
+    const testMessage = 'This is just a test message';
+    await channelPage.postMessage(testMessage);
+
+    // # Verify message posts without priority label
+    const lastPost = await channelPage.centerView.getLastPost();
+    await lastPost.toBeVisible();
+    await lastPost.toContainText(testMessage);
+    await expect(lastPost.container.locator('.post-priority')).not.toBeVisible();
+
+    // # Open post in RHS and verify
+    await lastPost.container.click();
+    await channelPage.sidebarRight.toBeVisible();
+
+    // # Get RHS post and verify content
+    const rhsPost = await channelPage.sidebarRight.getLastPost();
+    await rhsPost.toBeVisible();
+    await rhsPost.toContainText(testMessage);
+    await expect(rhsPost.container.locator('.post-priority')).not.toBeVisible();
+
+    // # Verify RHS formatting bar doesn't have priority button
+    await expect(channelPage.sidebarRight.postCreate.priorityButton).not.toBeVisible();
+});