diff --git a/packages/docusaurus-plugin-content-blog/src/__tests__/__fixtures__/authorsMapFiles/authors.yml b/packages/docusaurus-plugin-content-blog/src/__tests__/__fixtures__/authorsMapFiles/authors.yml
index 1d0cb11cd6ea..0dffb1f16c8a 100644
--- a/packages/docusaurus-plugin-content-blog/src/__tests__/__fixtures__/authorsMapFiles/authors.yml
+++ b/packages/docusaurus-plugin-content-blog/src/__tests__/__fixtures__/authorsMapFiles/authors.yml
@@ -1,4 +1,3 @@
-
 JMarcey:
   name: Joel Marcey
   title: Technical Lead & Developer Advocate at Facebook
@@ -32,3 +31,13 @@ lex111:
   title: Open-source enthusiast
   url: https://github.com/lex111
   image_url: https://github.com/lex111.png
+
+ozaki:
+  name: ozaki
+  title: ozaki
+  image_url: /ozaki.png
+
+ozakione:
+  name: ozakione
+  title: ozakione
+  image_url: /img/ozaki.png
diff --git a/packages/docusaurus-plugin-content-blog/src/__tests__/authors.test.ts b/packages/docusaurus-plugin-content-blog/src/__tests__/authors.test.ts
index 7072e8124caa..c1bf962c90ac 100644
--- a/packages/docusaurus-plugin-content-blog/src/__tests__/authors.test.ts
+++ b/packages/docusaurus-plugin-content-blog/src/__tests__/authors.test.ts
@@ -216,7 +216,7 @@ describe('getBlogPostAuthors', () => {
         authorsMap: {
           slorber: {
             name: 'Sébastien Lorber',
-            imageURL: '/img/slorber.png',
+            imageURL: '/baseUrl/img/slorber.png',
             key: 'slorber',
             page: null,
           },
@@ -419,7 +419,6 @@ describe('getBlogPostAuthors', () => {
         frontMatter: {
           authors: ['yangshun', 'jmarcey', 'slorber'],
         },
-
         authorsMap: {
           yangshun: {name: 'Yangshun Tay', key: 'yangshun', page: null},
           jmarcey: {name: 'Joel Marcey', key: 'jmarcey', page: null},
@@ -486,6 +485,235 @@ describe('getBlogPostAuthors', () => {
       Don't mix 'authors' with other existing 'author_*' front matter. Choose one or the other, not both at the same time."
     `);
   });
+
+  // Global author without baseUrl
+  it('getBlogPostAuthors do not modify global authors imageUrl without baseUrl', async () => {
+    expect(
+      getBlogPostAuthors({
+        frontMatter: {
+          authors: ['ozaki'],
+        },
+        authorsMap: {
+          ozaki: {
+            key: 'ozaki',
+            imageURL: '/ozaki.png',
+            page: null,
+          },
+        },
+        baseUrl: '/',
+      }),
+    ).toEqual([
+      {
+        imageURL: '/ozaki.png',
+        key: 'ozaki',
+        page: null,
+      },
+    ]);
+  });
+
+  // Global author with baseUrl
+  it('getBlogPostAuthors do not modify global authors imageUrl with baseUrl', async () => {
+    expect(
+      getBlogPostAuthors({
+        frontMatter: {
+          authors: ['ozaki'],
+        },
+        authorsMap: {
+          ozaki: {
+            key: 'ozaki',
+            imageURL: '/img/ozaki.png',
+            page: null,
+          },
+        },
+        baseUrl: '/img/',
+      }),
+    ).toEqual([
+      {
+        imageURL: '/img/ozaki.png',
+        key: 'ozaki',
+        page: null,
+      },
+    ]);
+  });
+
+  // Global author without baseUrl with a subfolder in img
+  it('getBlogPostAuthors do not modify globalAuthor imageUrl with subfolder without baseUrl', async () => {
+    expect(
+      getBlogPostAuthors({
+        frontMatter: {
+          authors: ['ozaki'],
+        },
+        authorsMap: {
+          ozaki: {
+            key: 'ozaki',
+            imageURL: '/img/ozaki.png',
+            page: null,
+          },
+        },
+        baseUrl: '/',
+      }),
+    ).toEqual([
+      {
+        imageURL: '/img/ozaki.png',
+        key: 'ozaki',
+        page: null,
+      },
+    ]);
+  });
+
+  // Global author with baseUrl with a subfolder in img
+  it('getBlogPostAuthors do not modify globalAuthor imageUrl with subfolder with baseUrl', async () => {
+    expect(
+      getBlogPostAuthors({
+        frontMatter: {
+          authors: ['ozaki'],
+        },
+        authorsMap: {
+          ozaki: {
+            key: 'ozaki',
+            imageURL: '/img/ozaki.png',
+            page: null,
+          },
+        },
+        baseUrl: '/img/',
+      }),
+    ).toEqual([
+      {
+        imageURL: '/img/ozaki.png',
+        key: 'ozaki',
+        page: null,
+      },
+    ]);
+  });
+
+  it('getBlogPostAuthors throws if global author imageURL does not have baseUrl', async () => {
+    expect(() =>
+      getBlogPostAuthors({
+        frontMatter: {
+          authors: ['ozaki'],
+        },
+        authorsMap: {
+          ozaki: {
+            key: 'ozaki',
+            imageURL: '/ozaki.png',
+            page: null,
+          },
+        },
+        baseUrl: '/baseUrl/',
+      }),
+    ).toThrowErrorMatchingInlineSnapshot(
+      `"Docusaurus internal bug: global authors image /ozaki.png should start with the expected baseUrl=/baseUrl/"`,
+    );
+  });
+
+  it('getBlogPostAuthors do not throws if inline author imageURL is a link to a file', async () => {
+    const baseUrlTest = getBlogPostAuthors({
+      frontMatter: {
+        authors: [{imageURL: './ozaki.png'}],
+      },
+      authorsMap: undefined,
+      baseUrl: '/baseUrl/',
+    });
+    const withoutBaseUrlTest = getBlogPostAuthors({
+      frontMatter: {
+        authors: [{imageURL: './ozaki.png'}],
+      },
+      authorsMap: undefined,
+      baseUrl: '/',
+    });
+    expect(() => baseUrlTest).not.toThrow();
+    expect(baseUrlTest).toEqual([
+      {
+        imageURL: './ozaki.png',
+        key: null,
+        page: null,
+      },
+    ]);
+    expect(() => withoutBaseUrlTest).not.toThrow();
+    expect(withoutBaseUrlTest).toEqual([
+      {
+        imageURL: './ozaki.png',
+        key: null,
+        page: null,
+      },
+    ]);
+  });
+
+  // Inline author without baseUrl
+  it('getBlogPostAuthors can return imageURL without baseUrl for inline authors', async () => {
+    expect(
+      getBlogPostAuthors({
+        frontMatter: {
+          authors: [{imageURL: '/ozaki.png'}],
+        },
+        authorsMap: undefined,
+        baseUrl: '/',
+      }),
+    ).toEqual([
+      {
+        imageURL: '/ozaki.png',
+        key: null,
+        page: null,
+      },
+    ]);
+  });
+
+  // Inline author with baseUrl
+  it('getBlogPostAuthors normalize imageURL with baseUrl for inline authors', async () => {
+    expect(
+      getBlogPostAuthors({
+        frontMatter: {
+          authors: [{imageURL: '/ozaki.png'}],
+        },
+        authorsMap: undefined,
+        baseUrl: '/img/',
+      }),
+    ).toEqual([
+      {
+        imageURL: '/img/ozaki.png',
+        key: null,
+        page: null,
+      },
+    ]);
+  });
+
+  // Inline author without baseUrl with a subfolder in img
+  it('getBlogPostAuthors normalize imageURL from subfolder without baseUrl for inline authors', async () => {
+    expect(
+      getBlogPostAuthors({
+        frontMatter: {
+          authors: [{imageURL: '/img/ozaki.png'}],
+        },
+        authorsMap: undefined,
+        baseUrl: '/',
+      }),
+    ).toEqual([
+      {
+        imageURL: '/img/ozaki.png',
+        key: null,
+        page: null,
+      },
+    ]);
+  });
+
+  // Inline author with baseUrl with a subfolder in img
+  it('getBlogPostAuthors normalize imageURL from subfolder with baseUrl for inline authors', async () => {
+    expect(
+      getBlogPostAuthors({
+        frontMatter: {
+          authors: [{imageURL: '/img/ozaki.png'}],
+        },
+        authorsMap: undefined,
+        baseUrl: '/img/',
+      }),
+    ).toEqual([
+      {
+        imageURL: '/img/img/ozaki.png',
+        key: null,
+        page: null,
+      },
+    ]);
+  });
 });
 
 describe('groupBlogPostsByAuthorKey', () => {
diff --git a/packages/docusaurus-plugin-content-blog/src/__tests__/authorsMap.test.ts b/packages/docusaurus-plugin-content-blog/src/__tests__/authorsMap.test.ts
index b6393ede6854..f9442ee82688 100644
--- a/packages/docusaurus-plugin-content-blog/src/__tests__/authorsMap.test.ts
+++ b/packages/docusaurus-plugin-content-blog/src/__tests__/authorsMap.test.ts
@@ -80,6 +80,7 @@ describe('getAuthorsMap', () => {
         contentPaths,
         authorsMapPath: 'authors.yml',
         authorsBaseRoutePath: '/authors',
+        baseUrl: '/',
       }),
     ).resolves.toBeDefined();
   });
@@ -90,6 +91,7 @@ describe('getAuthorsMap', () => {
         contentPaths,
         authorsMapPath: 'authors.json',
         authorsBaseRoutePath: '/authors',
+        baseUrl: '/',
       }),
     ).resolves.toBeDefined();
   });
@@ -100,9 +102,60 @@ describe('getAuthorsMap', () => {
         contentPaths,
         authorsMapPath: 'authors_does_not_exist.yml',
         authorsBaseRoutePath: '/authors',
+        baseUrl: '/',
       }),
     ).resolves.toBeUndefined();
   });
+
+  it('getAuthorsMap return imageURL with relative path', async () => {
+    const authorsMap = await getAuthorsMap({
+      contentPaths,
+      authorsMapPath: 'authors.yml',
+      authorsBaseRoutePath: '/authors',
+      baseUrl: '/',
+    });
+    expect(authorsMap?.ozaki?.imageURL).toBe('/ozaki.png');
+  });
+
+  it('getAuthorsMap normalize imageURL with baseUrl', async () => {
+    const authorsMap = await getAuthorsMap({
+      contentPaths,
+      authorsMapPath: 'authors.yml',
+      authorsBaseRoutePath: '/authors',
+      baseUrl: '/baseUrl/',
+    });
+    expect(authorsMap?.ozaki?.imageURL).toBe('/baseUrl/ozaki.png');
+  });
+
+  it('getAuthorsMap return imageURL with relative subdir path', async () => {
+    const authorsMap = await getAuthorsMap({
+      contentPaths,
+      authorsMapPath: 'authors.yml',
+      authorsBaseRoutePath: '/authors',
+      baseUrl: '/',
+    });
+    expect(authorsMap?.ozakione?.imageURL).toBe('/img/ozaki.png');
+  });
+
+  it('getAuthorsMap normalize imageURL with baseUrl and subdir same value', async () => {
+    const authorsMap = await getAuthorsMap({
+      contentPaths,
+      authorsMapPath: 'authors.yml',
+      authorsBaseRoutePath: '/authors',
+      baseUrl: '/img/',
+    });
+    expect(authorsMap?.ozakione?.imageURL).toBe('/img/img/ozaki.png');
+  });
+
+  it('getAuthorsMap normalize imageURL subdir with baseUrl', async () => {
+    const authorsMap = await getAuthorsMap({
+      contentPaths,
+      authorsMapPath: 'authors.yml',
+      authorsBaseRoutePath: '/authors',
+      baseUrl: '/blog/',
+    });
+    expect(authorsMap?.ozakione?.imageURL).toBe('/blog/img/ozaki.png');
+  });
 });
 
 describe('validateAuthorsMapInput', () => {
diff --git a/packages/docusaurus-plugin-content-blog/src/__tests__/feed.test.ts b/packages/docusaurus-plugin-content-blog/src/__tests__/feed.test.ts
index 3cca6f94aaf9..96d0d857d706 100644
--- a/packages/docusaurus-plugin-content-blog/src/__tests__/feed.test.ts
+++ b/packages/docusaurus-plugin-content-blog/src/__tests__/feed.test.ts
@@ -67,6 +67,7 @@ async function testGenerateFeeds(
     contentPaths,
     authorsMapPath: options.authorsMapPath,
     authorsBaseRoutePath: '/authors',
+    baseUrl: '/',
   });
 
   const blogPosts = await generateBlogPosts(
diff --git a/packages/docusaurus-plugin-content-blog/src/authors.ts b/packages/docusaurus-plugin-content-blog/src/authors.ts
index 1fe0ef923815..bc6b152157b2 100644
--- a/packages/docusaurus-plugin-content-blog/src/authors.ts
+++ b/packages/docusaurus-plugin-content-blog/src/authors.ts
@@ -21,18 +21,41 @@ type AuthorsParam = {
   baseUrl: string;
 };
 
-function normalizeImageUrl({
+export function normalizeImageUrl({
   imageURL,
   baseUrl,
 }: {
   imageURL: string | undefined;
   baseUrl: string;
-}) {
+}): string | undefined {
   return imageURL?.startsWith('/')
     ? normalizeUrl([baseUrl, imageURL])
     : imageURL;
 }
 
+function normalizeAuthorUrl({
+  author,
+  baseUrl,
+}: {
+  author: Author;
+  baseUrl: string;
+}): string | undefined {
+  if (author.key) {
+    // Ensures invariant: global authors should have already been normalized
+    if (
+      author.imageURL?.startsWith('/') &&
+      !author.imageURL.startsWith(baseUrl)
+    ) {
+      throw new Error(
+        `Docusaurus internal bug: global authors image ${author.imageURL} should start with the expected baseUrl=${baseUrl}`,
+      );
+    }
+
+    return author.imageURL;
+  }
+  return normalizeImageUrl({imageURL: author.imageURL, baseUrl});
+}
+
 // Legacy v1/early-v2 front matter fields
 // We may want to deprecate those in favor of using only frontMatter.authors
 // TODO Docusaurus v4: remove this legacy front matter
@@ -116,13 +139,14 @@ ${Object.keys(authorsMap)
       // Author def from authorsMap can be locally overridden by front matter
       ...getAuthorsMapAuthor(frontMatterAuthor.key),
       ...frontMatterAuthor,
-    };
+    } as Author;
 
     return {
       ...author,
       key: author.key ?? null,
       page: author.page ?? null,
-      imageURL: normalizeImageUrl({imageURL: author.imageURL, baseUrl}),
+      // global author images have already been normalized
+      imageURL: normalizeAuthorUrl({author, baseUrl}),
     };
   }
 }
diff --git a/packages/docusaurus-plugin-content-blog/src/authorsMap.ts b/packages/docusaurus-plugin-content-blog/src/authorsMap.ts
index d1378aa3f26d..e5c358b422f5 100644
--- a/packages/docusaurus-plugin-content-blog/src/authorsMap.ts
+++ b/packages/docusaurus-plugin-content-blog/src/authorsMap.ts
@@ -9,12 +9,13 @@ import _ from 'lodash';
 import {readDataFile, normalizeUrl} from '@docusaurus/utils';
 import {Joi, URISchema} from '@docusaurus/utils-validation';
 import {AuthorSocialsSchema, normalizeSocials} from './authorsSocials';
+import {normalizeImageUrl} from './authors';
 import type {BlogContentPaths} from './types';
 import type {
-  Author,
   AuthorAttributes,
   AuthorPage,
   AuthorsMap,
+  AuthorWithKey,
 } from '@docusaurus/plugin-content-blog';
 
 type AuthorInput = AuthorAttributes & {
@@ -93,12 +94,14 @@ export function checkAuthorsMapPermalinkCollisions(
 function normalizeAuthor({
   authorsBaseRoutePath,
   authorKey,
+  baseUrl,
   author,
 }: {
   authorsBaseRoutePath: string;
   authorKey: string;
+  baseUrl: string;
   author: AuthorInput;
-}): Author & {key: string} {
+}): AuthorWithKey {
   function getAuthorPage(): AuthorPage | null {
     if (!author.page) {
       return null;
@@ -114,6 +117,7 @@ function normalizeAuthor({
     ...author,
     key: authorKey,
     page: getAuthorPage(),
+    imageURL: normalizeImageUrl({imageURL: author.imageURL, baseUrl}),
     socials: author.socials ? normalizeSocials(author.socials) : undefined,
   };
 }
@@ -121,12 +125,14 @@ function normalizeAuthor({
 function normalizeAuthorsMap({
   authorsBaseRoutePath,
   authorsMapInput,
+  baseUrl,
 }: {
   authorsBaseRoutePath: string;
   authorsMapInput: AuthorsMapInput;
+  baseUrl: string;
 }): AuthorsMap {
   return _.mapValues(authorsMapInput, (author, authorKey) => {
-    return normalizeAuthor({authorsBaseRoutePath, authorKey, author});
+    return normalizeAuthor({authorsBaseRoutePath, authorKey, author, baseUrl});
   });
 }
 
@@ -153,6 +159,7 @@ export async function getAuthorsMap(params: {
   authorsMapPath: string;
   authorsBaseRoutePath: string;
   contentPaths: BlogContentPaths;
+  baseUrl: string;
 }): Promise<AuthorsMap | undefined> {
   const authorsMapInput = await getAuthorsMapInput(params);
   if (!authorsMapInput) {
diff --git a/packages/docusaurus-plugin-content-blog/src/index.ts b/packages/docusaurus-plugin-content-blog/src/index.ts
index e40cfeab6196..8325cc06d302 100644
--- a/packages/docusaurus-plugin-content-blog/src/index.ts
+++ b/packages/docusaurus-plugin-content-blog/src/index.ts
@@ -271,6 +271,7 @@ export default async function pluginContentBlog(
           routeBasePath,
           authorsBasePath,
         ]),
+        baseUrl,
       });
       checkAuthorsMapPermalinkCollisions(authorsMap);