diff --git a/.changeset/khaki-otters-return.md b/.changeset/khaki-otters-return.md
new file mode 100644
index 000000000000..8d0873fe96be
--- /dev/null
+++ b/.changeset/khaki-otters-return.md
@@ -0,0 +1,5 @@
+---
+"@astrojs/markdown-remark": major
+---
+
+Removes deprecated APIs including `remarkShiki`, `remarkPrism`, `replaceCssVariables` and several unused types
diff --git a/packages/astro/src/@types/astro.ts b/packages/astro/src/@types/astro.ts
index dbf929320af0..df45fa410748 100644
--- a/packages/astro/src/@types/astro.ts
+++ b/packages/astro/src/@types/astro.ts
@@ -2,8 +2,7 @@ import type { OutgoingHttpHeaders } from 'node:http';
 import type { AddressInfo } from 'node:net';
 import type {
 	MarkdownHeading,
-	MarkdownMetadata,
-	MarkdownRenderingResult,
+	MarkdownVFile,
 	RehypePlugins,
 	RemarkPlugins,
 	RemarkRehype,
@@ -45,8 +44,6 @@ export { type AstroIntegrationLogger };
 
 export type {
 	MarkdownHeading,
-	MarkdownMetadata,
-	MarkdownRenderingResult,
 	RehypePlugins,
 	RemarkPlugins,
 	ShikiConfig,
@@ -2188,6 +2185,21 @@ export interface ManifestData {
 	routes: RouteData[];
 }
 
+/** @deprecated Type is no longer used by exported APIs */
+export interface MarkdownMetadata {
+	headings: MarkdownHeading[];
+	source: string;
+	html: string;
+}
+
+/** @deprecated Type is no longer used by exported APIs */
+export interface MarkdownRenderingResult {
+	metadata: MarkdownMetadata;
+	vfile: MarkdownVFile;
+	code: string;
+}
+
+/** @deprecated Type is no longer used by exported APIs */
 export interface MarkdownParserResponse extends MarkdownRenderingResult {
 	frontmatter: MD['frontmatter'];
 }
diff --git a/packages/markdown/remark/src/index.ts b/packages/markdown/remark/src/index.ts
index ef1afc8fba18..00d6d64ca127 100644
--- a/packages/markdown/remark/src/index.ts
+++ b/packages/markdown/remark/src/index.ts
@@ -26,9 +26,7 @@ export { rehypeHeadingIds } from './rehype-collect-headings.js';
 export { remarkCollectImages } from './remark-collect-images.js';
 export { rehypePrism } from './rehype-prism.js';
 export { rehypeShiki } from './rehype-shiki.js';
-export { remarkPrism } from './remark-prism.js';
-export { remarkShiki } from './remark-shiki.js';
-export { createShikiHighlighter, replaceCssVariables, type ShikiHighlighter } from './shiki.js';
+export { createShikiHighlighter, type ShikiHighlighter } from './shiki.js';
 export * from './types.js';
 
 export const markdownConfigDefaults: Required<AstroMarkdownOptions> = {
diff --git a/packages/markdown/remark/src/remark-prism.ts b/packages/markdown/remark/src/remark-prism.ts
deleted file mode 100644
index 49e38d73cfd7..000000000000
--- a/packages/markdown/remark/src/remark-prism.ts
+++ /dev/null
@@ -1,22 +0,0 @@
-import { runHighlighterWithAstro } from '@astrojs/prism/dist/highlighter';
-import { visit } from 'unist-util-visit';
-import type { RemarkPlugin } from './types.js';
-
-/**
- * @deprecated Use `rehypePrism` instead
- */
-export function remarkPrism(): ReturnType<RemarkPlugin> {
-	return function (tree: any) {
-		visit(tree, 'code', (node) => {
-			let { lang, value } = node;
-			node.type = 'html';
-
-			let { html, classLanguage } = runHighlighterWithAstro(lang, value);
-			let classes = [classLanguage];
-			node.value = `<pre class="${classes.join(
-				' '
-			)}"><code is:raw class="${classLanguage}">${html}</code></pre>`;
-			return node;
-		});
-	};
-}
diff --git a/packages/markdown/remark/src/remark-shiki.ts b/packages/markdown/remark/src/remark-shiki.ts
deleted file mode 100644
index 512cd453aa38..000000000000
--- a/packages/markdown/remark/src/remark-shiki.ts
+++ /dev/null
@@ -1,24 +0,0 @@
-import { visit } from 'unist-util-visit';
-import { type ShikiHighlighter, createShikiHighlighter } from './shiki.js';
-import type { RemarkPlugin, ShikiConfig } from './types.js';
-
-/**
- * @deprecated Use `rehypeShiki` instead
- */
-export function remarkShiki(config?: ShikiConfig): ReturnType<RemarkPlugin> {
-	let highlighterAsync: Promise<ShikiHighlighter> | undefined;
-
-	return async (tree: any) => {
-		highlighterAsync ??= createShikiHighlighter(config);
-		const highlighter = await highlighterAsync;
-
-		visit(tree, 'code', (node) => {
-			const lang = typeof node.lang === 'string' ? node.lang : 'plaintext';
-			const html = highlighter.highlight(node.value, lang);
-
-			node.type = 'html';
-			node.value = html;
-			node.children = [];
-		});
-	};
-}
diff --git a/packages/markdown/remark/src/shiki.ts b/packages/markdown/remark/src/shiki.ts
index c4fef6f7a4f7..f3f9d63bf414 100644
--- a/packages/markdown/remark/src/shiki.ts
+++ b/packages/markdown/remark/src/shiki.ts
@@ -167,10 +167,6 @@ function normalizePropAsString(value: Properties[string]): string | null {
 	return Array.isArray(value) ? value.join(' ') : (value as string | null);
 }
 
-/**
- * shiki -> shikiji compat as we need to manually replace it
- * @internal Exported for error overlay use only
- */
-export function replaceCssVariables(str: string) {
+function replaceCssVariables(str: string) {
 	return str.replace(COLOR_REPLACEMENT_REGEX, (match) => ASTRO_COLOR_REPLACEMENTS[match] || match);
 }
diff --git a/packages/markdown/remark/src/types.ts b/packages/markdown/remark/src/types.ts
index 1fb89316d60e..5861f9e6f9c6 100644
--- a/packages/markdown/remark/src/types.ts
+++ b/packages/markdown/remark/src/types.ts
@@ -53,13 +53,6 @@ export interface AstroMarkdownOptions {
 	smartypants?: boolean;
 }
 
-export interface ImageMetadata {
-	src: string;
-	width: number;
-	height: number;
-	type: string;
-}
-
 export interface MarkdownProcessor {
 	render: (
 		content: string,
@@ -83,31 +76,15 @@ export interface MarkdownProcessorRenderResult {
 	};
 }
 
-export interface MarkdownRenderingOptions
-	extends AstroMarkdownOptions,
-		MarkdownProcessorRenderOptions {}
-
 export interface MarkdownHeading {
 	depth: number;
 	slug: string;
 	text: string;
 }
 
-export interface MarkdownMetadata {
-	headings: MarkdownHeading[];
-	source: string;
-	html: string;
-}
-
 export interface MarkdownVFile extends VFile {
 	data: {
 		__astroHeadings?: MarkdownHeading[];
 		imagePaths?: Set<string>;
 	};
 }
-
-export interface MarkdownRenderingResult {
-	metadata: MarkdownMetadata;
-	vfile: MarkdownVFile;
-	code: string;
-}