diff --git a/packages/edit-site/src/components/editor/use-resolve-edited-entity.js b/packages/edit-site/src/components/editor/use-resolve-edited-entity.js
index c460fd28870d95..0288ba0cd0ac3b 100644
--- a/packages/edit-site/src/components/editor/use-resolve-edited-entity.js
+++ b/packages/edit-site/src/components/editor/use-resolve-edited-entity.js
@@ -47,8 +47,6 @@ function getPostType( name ) {
 		postType = 'page';
 	} else if ( name === 'post-item' || name === 'posts' ) {
 		postType = 'post';
-	} else if ( name === 'attachment-item' ) {
-		postType = ATTACHMENT_POST_TYPE;
 	}
 
 	return postType;
diff --git a/packages/edit-site/src/components/site-editor-routes/attachment-item.js b/packages/edit-site/src/components/site-editor-routes/attachment-item.js
deleted file mode 100644
index 9a5c7637e9b453..00000000000000
--- a/packages/edit-site/src/components/site-editor-routes/attachment-item.js
+++ /dev/null
@@ -1,27 +0,0 @@
-/**
- * WordPress dependencies
- */
-import { __ } from '@wordpress/i18n';
-
-/**
- * Internal dependencies
- */
-import Editor from '../editor';
-import SidebarNavigationScreen from '../sidebar-navigation-screen';
-
-export const attachmentItemRoute = {
-	name: 'attachment-item',
-	path: '/attachment/:postId',
-	areas: {
-		sidebar: (
-			<SidebarNavigationScreen
-				title={ __( 'Media' ) }
-				backPath="/"
-				// Empty content - no sidebar list needed for attachments
-				content={ null }
-			/>
-		),
-		mobile: <Editor />,
-		preview: <Editor />,
-	},
-};
diff --git a/packages/edit-site/src/components/site-editor-routes/index.js b/packages/edit-site/src/components/site-editor-routes/index.js
index 231cae42894f69..db4307df7a6f9e 100644
--- a/packages/edit-site/src/components/site-editor-routes/index.js
+++ b/packages/edit-site/src/components/site-editor-routes/index.js
@@ -21,12 +21,10 @@ import { templatesRoute } from './templates';
 import { templateItemRoute } from './template-item';
 import { pagesRoute } from './pages';
 import { pageItemRoute } from './page-item';
-import { attachmentItemRoute } from './attachment-item';
 import { stylebookRoute } from './stylebook';
 import { notFoundRoute } from './notfound';
 
 const routes = [
-	...( window?.__experimentalMediaEditor ? [ attachmentItemRoute ] : [] ),
 	pageItemRoute,
 	pagesRoute,
 	templateItemRoute,
diff --git a/packages/editor/src/components/editor-interface/index.js b/packages/editor/src/components/editor-interface/index.js
index d90b72212100d3..a60de573266f64 100644
--- a/packages/editor/src/components/editor-interface/index.js
+++ b/packages/editor/src/components/editor-interface/index.js
@@ -36,7 +36,6 @@ import SavePublishPanels from '../save-publish-panels';
 import TextEditor from '../text-editor';
 import VisualEditor from '../visual-editor';
 import StylesCanvas from '../styles-canvas';
-import { MediaPreview } from '../media';
 
 const interfaceLabels = {
 	/* translators: accessibility text for the editor top bar landmark region. */
@@ -83,7 +82,6 @@ export default function EditorInterface( {
 		mode,
 		postId,
 		postType,
-		isAttachment,
 		isInserterOpened,
 		isListViewOpened,
 		isDistractionFree,
@@ -130,9 +128,6 @@ export default function EditorInterface( {
 			postTypeLabel: getPostTypeLabel(),
 			stylesPath: getStylesPath(),
 			showStylebook: getShowStylebook(),
-			isAttachment:
-				getCurrentPostType() === 'attachment' &&
-				window?.__experimentalMediaEditor,
 			isRevisionsMode: _isRevisionsMode(),
 			showDiff: isShowingRevisionDiff(),
 		};
@@ -147,12 +142,9 @@ export default function EditorInterface( {
 	const secondarySidebarLabel = isListViewOpened
 		? __( 'Document Overview' )
 		: __( 'Block Library' );
-	const shouldShowMediaEditor = !! isAttachment;
 	const shouldShowStylesCanvas =
-		! isAttachment &&
-		( showStylebook || stylesPath?.startsWith( '/revisions' ) );
-	const shouldShowBlockEditor =
-		! shouldShowMediaEditor && ! shouldShowStylesCanvas;
+		showStylebook || stylesPath?.startsWith( '/revisions' );
+	const shouldShowBlockEditor = ! shouldShowStylesCanvas;
 
 	// Local state for save panel.
 	// Note 'truthy' callback implies an open panel.
@@ -211,7 +203,6 @@ export default function EditorInterface( {
 			}
 			editorNotices={ <Notices /> }
 			secondarySidebar={
-				! isAttachment &&
 				! isPreviewMode &&
 				mode === 'visual' &&
 				( ( isInserterOpened && <InserterSidebar /> ) ||
@@ -224,9 +215,6 @@ export default function EditorInterface( {
 			content={
 				<>
 					{ ! isDistractionFree && ! isPreviewMode && <Notices /> }
-					{ shouldShowMediaEditor && (
-						<MediaPreview { ...iframeProps } />
-					) }
 					{ shouldShowStylesCanvas && <StylesCanvas /> }
 					{ shouldShowBlockEditor && (
 						<>
diff --git a/packages/editor/src/components/header/index.js b/packages/editor/src/components/header/index.js
index 6f374aa0848fb4..7f270ff485ae05 100644
--- a/packages/editor/src/components/header/index.js
+++ b/packages/editor/src/components/header/index.js
@@ -50,7 +50,6 @@ function Header( {
 		hasBlockSelection,
 		hasSectionRootClientId,
 		isStylesCanvasActive,
-		isAttachment,
 	} = useSelect( ( select ) => {
 		const { get: getPreference } = select( preferencesStore );
 		const {
@@ -78,9 +77,6 @@ function Header( {
 			isStylesCanvasActive:
 				!! getStylesPath()?.startsWith( '/revisions' ) ||
 				getShowStylebook(),
-			isAttachment:
-				getCurrentPostType() === ATTACHMENT_POST_TYPE &&
-				window?.__experimentalMediaEditor,
 		};
 	}, [] );
 
@@ -109,13 +105,11 @@ function Header( {
 		<HeaderSkeleton
 			toolbar={
 				<>
-					{ ! isAttachment && (
-						<DocumentTools
-							disableBlockTools={
-								isStylesCanvasActive || isTextEditor
-							}
-						/>
-					) }
+					<DocumentTools
+						disableBlockTools={
+							isStylesCanvasActive || isTextEditor
+						}
+					/>
 					{ hasFixedToolbar && isLargeViewport && (
 						<CollapsibleBlockToolbar
 							isCollapsed={ isBlockToolsCollapsed }
@@ -183,7 +177,7 @@ function Header( {
 						/>
 					) }
 					{ customSaveButton }
-					{ ! isAttachment && <MoreMenu /> }
+					<MoreMenu />
 				</>
 			}
 		/>
diff --git a/packages/editor/src/components/media/index.js b/packages/editor/src/components/media/index.js
deleted file mode 100644
index 88d892af3473c8..00000000000000
--- a/packages/editor/src/components/media/index.js
+++ /dev/null
@@ -1,2 +0,0 @@
-export { default as MediaPreview } from './preview';
-export { default as MediaMetadataPanel } from './metadata-panel';
diff --git a/packages/editor/src/components/media/metadata-panel.js b/packages/editor/src/components/media/metadata-panel.js
deleted file mode 100644
index f7e1f5e3db20fb..00000000000000
--- a/packages/editor/src/components/media/metadata-panel.js
+++ /dev/null
@@ -1,77 +0,0 @@
-/**
- * WordPress dependencies
- */
-import { MediaEditorProvider, MediaForm } from '@wordpress/media-editor';
-import { useSelect, useDispatch } from '@wordpress/data';
-import { useMemo } from '@wordpress/element';
-import { store as coreStore } from '@wordpress/core-data';
-
-/**
- * Internal dependencies
- */
-import { store as editorStore } from '../../store';
-import usePostFields from '../post-fields';
-import PostCardPanel from '../post-card-panel';
-import PostPanelSection from '../post-panel-section';
-
-/**
- * Media metadata panel for the editor sidebar.
- * Displays a form for editing media properties with PostCardPanel header.
- *
- * @param {Object}   props                   - Component props.
- * @param {Function} props.onActionPerformed - Callback when an action is performed.
- * @return {Element} The MediaMetadataPanel component.
- */
-export default function MediaMetadataPanel( { onActionPerformed } ) {
-	const { media, postType, postId } = useSelect( ( select ) => {
-		const _postType = select( editorStore ).getCurrentPostType();
-		const _postId = select( editorStore ).getCurrentPostId();
-		const currentPost = select( coreStore ).getEditedEntityRecord(
-			'postType',
-			_postType,
-			_postId,
-			{
-				_embed: 'author,wp:attached-to',
-			}
-		);
-		return {
-			media: currentPost,
-			postType: _postType,
-			postId: _postId,
-		};
-	}, [] );
-
-	const { editPost } = useDispatch( editorStore );
-	const fields = usePostFields( { postType: 'attachment' } );
-
-	const settings = useMemo(
-		() => ( {
-			fields,
-		} ),
-		[ fields ]
-	);
-
-	const handleUpdate = ( updates ) => {
-		editPost( updates );
-	};
-
-	return (
-		<PostPanelSection className="editor-media-metadata-panel">
-			<MediaEditorProvider
-				value={ media }
-				settings={ settings }
-				onChange={ handleUpdate }
-			>
-				<MediaForm
-					header={
-						<PostCardPanel
-							postType={ postType }
-							postId={ postId }
-							onActionPerformed={ onActionPerformed }
-						/>
-					}
-				/>
-			</MediaEditorProvider>
-		</PostPanelSection>
-	);
-}
diff --git a/packages/editor/src/components/media/preview.js b/packages/editor/src/components/media/preview.js
deleted file mode 100644
index c443c2d964b011..00000000000000
--- a/packages/editor/src/components/media/preview.js
+++ /dev/null
@@ -1,35 +0,0 @@
-/**
- * WordPress dependencies
- */
-import {
-	MediaEditorProvider,
-	MediaPreview as BaseMediaPreview,
-} from '@wordpress/media-editor';
-import { useSelect } from '@wordpress/data';
-
-/**
- * Internal dependencies
- */
-import { store as editorStore } from '../../store';
-
-/**
- * Media preview component for the editor.
- * Connects the base MediaPreview component to the editor store.
- *
- * @param {Object} props - Additional props to spread on MediaPreview.
- * @return {Element} The MediaPreview component.
- */
-export default function MediaPreview( props ) {
-	const { media } = useSelect( ( select ) => {
-		const currentPost = select( editorStore ).getCurrentPost();
-		return {
-			media: currentPost,
-		};
-	}, [] );
-
-	return (
-		<MediaEditorProvider value={ media }>
-			<BaseMediaPreview { ...props } />
-		</MediaEditorProvider>
-	);
-}
diff --git a/packages/editor/src/components/post-publish-button/label.js b/packages/editor/src/components/post-publish-button/label.js
index 5fa28c3b41907e..ba91510558cbf3 100644
--- a/packages/editor/src/components/post-publish-button/label.js
+++ b/packages/editor/src/components/post-publish-button/label.js
@@ -9,7 +9,6 @@ import { useViewportMatch } from '@wordpress/compose';
  * Internal dependencies
  */
 import { store as editorStore } from '../../store';
-import { ATTACHMENT_POST_TYPE } from '../../store/constants';
 
 /**
  * Renders the label for the publish button.
@@ -28,7 +27,6 @@ export default function PublishButtonLabel() {
 		hasNonPostEntityChanges,
 		postStatusHasChanged,
 		postStatus,
-		postType,
 		isPostSavingLocked,
 	} = useSelect( ( select ) => {
 		const {
@@ -37,7 +35,6 @@ export default function PublishButtonLabel() {
 			isSavingPost,
 			isPublishingPost,
 			getCurrentPost,
-			getCurrentPostType,
 			isAutosavingPost,
 			getPostEdits,
 			getEditedPostAttribute,
@@ -49,7 +46,6 @@ export default function PublishButtonLabel() {
 			isPublishing: isPublishingPost(),
 			hasPublishAction:
 				getCurrentPost()._links?.[ 'wp:action-publish' ] ?? false,
-			postType: getCurrentPostType(),
 			isAutosaving: isAutosavingPost(),
 			hasNonPostEntityChanges:
 				select( editorStore ).hasNonPostEntityChanges(),
@@ -70,13 +66,6 @@ export default function PublishButtonLabel() {
 		return __( 'Saving…' );
 	}
 	if ( ! hasPublishAction ) {
-		// For attachments, always show "Save" since they don't have a publish workflow
-		if (
-			postType === ATTACHMENT_POST_TYPE &&
-			window?.__experimentalMediaEditor
-		) {
-			return __( 'Save' );
-		}
 		// TODO: this is because "Submit for review" string is too long in some languages.
 		// @see https://github.com/WordPress/gutenberg/issues/10475
 		return isSmallerThanMediumViewport
diff --git a/packages/editor/src/components/provider/index.js b/packages/editor/src/components/provider/index.js
index 0708561db201a3..eaf6420d4a3c11 100644
--- a/packages/editor/src/components/provider/index.js
+++ b/packages/editor/src/components/provider/index.js
@@ -28,7 +28,6 @@ import { createBlock } from '@wordpress/blocks';
  */
 import withRegistryProvider from './with-registry-provider';
 import { store as editorStore } from '../../store';
-import { ATTACHMENT_POST_TYPE } from '../../store/constants';
 import useBlockEditorSettings from './use-block-editor-settings';
 import { unlock } from '../../lock-unlock';
 import DisableNonPageContentBlocks from './disable-non-page-content-blocks';
@@ -401,31 +400,6 @@ export const ExperimentalEditorProvider = withRegistryProvider(
 			return null;
 		}
 
-		const isAttachment =
-			post.type === ATTACHMENT_POST_TYPE &&
-			window?.__experimentalMediaEditor;
-
-		// Early return for attachments - no block editor needed
-		if ( isAttachment ) {
-			return (
-				<EntityProvider kind="root" type="site">
-					<EntityProvider
-						kind="postType"
-						type={ post.type }
-						id={ post.id }
-					>
-						{ children }
-						{ ! settings.isPreviewMode && (
-							<>
-								<EditorKeyboardShortcuts />
-								<KeyboardShortcutHelpModal />
-							</>
-						) }
-					</EntityProvider>
-				</EntityProvider>
-			);
-		}
-
 		return (
 			<EntityProvider kind="root" type="site">
 				<EntityProvider
diff --git a/packages/editor/src/components/sidebar/header.js b/packages/editor/src/components/sidebar/header.js
index b67fd7acaceb6c..6bcb2dd742afb3 100644
--- a/packages/editor/src/components/sidebar/header.js
+++ b/packages/editor/src/components/sidebar/header.js
@@ -11,30 +11,22 @@ import { decodeEntities } from '@wordpress/html-entities';
  * Internal dependencies
  */
 import { store as editorStore } from '../../store';
-import { ATTACHMENT_POST_TYPE } from '../../store/constants';
 import { unlock } from '../../lock-unlock';
 import { sidebars } from './constants';
 
 const { Tabs } = unlock( componentsPrivateApis );
 
 const SidebarHeader = ( _, ref ) => {
-	const { postTypeLabel, isAttachment, isRevisionsMode } = useSelect(
-		( select ) => {
-			const { getPostTypeLabel, getCurrentPostType } =
-				select( editorStore );
-			const { isRevisionsMode: _isRevisionsMode } = unlock(
-				select( editorStore )
-			);
-			return {
-				postTypeLabel: getPostTypeLabel(),
-				isAttachment:
-					getCurrentPostType() === ATTACHMENT_POST_TYPE &&
-					window?.__experimentalMediaEditor,
-				isRevisionsMode: _isRevisionsMode(),
-			};
-		},
-		[]
-	);
+	const { postTypeLabel, isRevisionsMode } = useSelect( ( select ) => {
+		const { getPostTypeLabel } = select( editorStore );
+		const { isRevisionsMode: _isRevisionsMode } = unlock(
+			select( editorStore )
+		);
+		return {
+			postTypeLabel: getPostTypeLabel(),
+			isRevisionsMode: _isRevisionsMode(),
+		};
+	}, [] );
 
 	let documentLabel;
 	if ( isRevisionsMode ) {
@@ -55,16 +47,14 @@ const SidebarHeader = ( _, ref ) => {
 			>
 				{ documentLabel }
 			</Tabs.Tab>
-			{ ! isAttachment && (
-				<Tabs.Tab
-					tabId={ sidebars.block }
-					// Used for focus management in the SettingsSidebar component.
-					data-tab-id={ sidebars.block }
-				>
-					{ /* translators: Text label for the Block Settings Sidebar tab. */ }
-					{ __( 'Block' ) }
-				</Tabs.Tab>
-			) }
+			<Tabs.Tab
+				tabId={ sidebars.block }
+				// Used for focus management in the SettingsSidebar component.
+				data-tab-id={ sidebars.block }
+			>
+				{ /* translators: Text label for the Block Settings Sidebar tab. */ }
+				{ __( 'Block' ) }
+			</Tabs.Tab>
 		</Tabs.TabList>
 	);
 };
diff --git a/packages/editor/src/components/sidebar/index.js b/packages/editor/src/components/sidebar/index.js
index 0d45a931ad45e3..cf2951813afafb 100644
--- a/packages/editor/src/components/sidebar/index.js
+++ b/packages/editor/src/components/sidebar/index.js
@@ -33,7 +33,6 @@ import SidebarHeader from './header';
 import TemplateActionsPanel from '../template-actions-panel';
 import TemplateContentPanel from '../template-content-panel';
 import TemplatePartContentPanel from '../template-part-content-panel';
-import { MediaMetadataPanel } from '../media';
 import PostRevisionsPanel from '../post-revisions-panel';
 import RevisionBlockDiffPanel from '../revision-block-diff';
 import useAutoSwitchEditorSidebars from '../provider/use-auto-switch-editor-sidebars';
@@ -41,7 +40,6 @@ import { sidebars } from './constants';
 import { unlock } from '../../lock-unlock';
 import { store as editorStore } from '../../store';
 import {
-	ATTACHMENT_POST_TYPE,
 	NAVIGATION_POST_TYPE,
 	TEMPLATE_PART_POST_TYPE,
 	TEMPLATE_POST_TYPE,
@@ -66,7 +64,6 @@ const SidebarContent = ( {
 	// need to forward the `Tabs` context so it can be passed through the
 	// underlying slot/fill.
 	const tabsContextValue = useContext( Tabs.Context );
-	const isAttachment = postType === ATTACHMENT_POST_TYPE;
 	const isRevisionsMode = useSelect( ( select ) => {
 		return unlock( select( editorStore ) ).isRevisionsMode();
 	} );
@@ -99,11 +96,7 @@ const SidebarContent = ( {
 	}, [ tabName ] );
 
 	let tabContent;
-	if ( isAttachment ) {
-		tabContent = (
-			<MediaMetadataPanel onActionPerformed={ onActionPerformed } />
-		);
-	} else if ( isRevisionsMode ) {
+	if ( isRevisionsMode ) {
 		tabContent = <PostRevisionSummary />;
 	} else {
 		tabContent = (
@@ -159,12 +152,10 @@ const SidebarContent = ( {
 				<Tabs.TabPanel tabId={ sidebars.document } focusable={ false }>
 					{ tabContent }
 				</Tabs.TabPanel>
-				{ ! isAttachment && (
-					<Tabs.TabPanel tabId={ sidebars.block } focusable={ false }>
-						<BlockInspector />
-						{ isRevisionsMode && <RevisionBlockDiffPanel /> }
-					</Tabs.TabPanel>
-				) }
+				<Tabs.TabPanel tabId={ sidebars.block } focusable={ false }>
+					<BlockInspector />
+					{ isRevisionsMode && <RevisionBlockDiffPanel /> }
+				</Tabs.TabPanel>
 			</Tabs.Context.Provider>
 		</PluginSidebar>
 	);
diff --git a/packages/editor/src/dataviews/store/private-actions.ts b/packages/editor/src/dataviews/store/private-actions.ts
index e9b9882fbadc3f..c8023428544c54 100644
--- a/packages/editor/src/dataviews/store/private-actions.ts
+++ b/packages/editor/src/dataviews/store/private-actions.ts
@@ -65,7 +65,6 @@ import { unlock } from '../../lock-unlock';
 declare global {
 	interface Window {
 		__experimentalTemplateActivate?: boolean;
-		__experimentalMediaEditor?: boolean;
 	}
 }