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 19515459a656..052437c3dec6 100644
--- a/packages/docusaurus-plugin-content-blog/src/__tests__/authors.test.ts
+++ b/packages/docusaurus-plugin-content-blog/src/__tests__/authors.test.ts
@@ -19,6 +19,7 @@ describe('getBlogPostAuthors', () => {
       getBlogPostAuthors({
         frontMatter: {},
         authorsMap: undefined,
+        baseUrl: '/',
       }),
     ).toEqual([]);
     expect(
@@ -27,6 +28,7 @@ describe('getBlogPostAuthors', () => {
           authors: [],
         },
         authorsMap: undefined,
+        baseUrl: '/',
       }),
     ).toEqual([]);
   });
@@ -38,6 +40,7 @@ describe('getBlogPostAuthors', () => {
           author: 'Sébastien Lorber',
         },
         authorsMap: undefined,
+        baseUrl: '/',
       }),
     ).toEqual([{name: 'Sébastien Lorber'}]);
     expect(
@@ -46,6 +49,7 @@ describe('getBlogPostAuthors', () => {
           authorTitle: 'maintainer',
         },
         authorsMap: undefined,
+        baseUrl: '/',
       }),
     ).toEqual([{title: 'maintainer'}]);
     expect(
@@ -54,8 +58,27 @@ describe('getBlogPostAuthors', () => {
           authorImageURL: 'https://github.com/slorber.png',
         },
         authorsMap: undefined,
+        baseUrl: '/',
       }),
     ).toEqual([{imageURL: 'https://github.com/slorber.png'}]);
+    expect(
+      getBlogPostAuthors({
+        frontMatter: {
+          authorImageURL: '/img/slorber.png',
+        },
+        authorsMap: undefined,
+        baseUrl: '/',
+      }),
+    ).toEqual([{imageURL: '/img/slorber.png'}]);
+    expect(
+      getBlogPostAuthors({
+        frontMatter: {
+          authorImageURL: '/img/slorber.png',
+        },
+        authorsMap: undefined,
+        baseUrl: '/baseURL',
+      }),
+    ).toEqual([{imageURL: '/baseURL/img/slorber.png'}]);
     expect(
       getBlogPostAuthors({
         frontMatter: {
@@ -68,6 +91,7 @@ describe('getBlogPostAuthors', () => {
           authorURL: 'https://github.com/slorber2',
         },
         authorsMap: undefined,
+        baseUrl: '/',
       }),
     ).toEqual([
       {
@@ -86,8 +110,69 @@ describe('getBlogPostAuthors', () => {
           authors: 'slorber',
         },
         authorsMap: {slorber: {name: 'Sébastien Lorber'}},
+        baseUrl: '/',
       }),
     ).toEqual([{key: 'slorber', name: 'Sébastien Lorber'}]);
+    expect(
+      getBlogPostAuthors({
+        frontMatter: {
+          authors: 'slorber',
+        },
+        authorsMap: {
+          slorber: {
+            name: 'Sébastien Lorber',
+            imageURL: 'https://github.com/slorber.png',
+          },
+        },
+        baseUrl: '/',
+      }),
+    ).toEqual([
+      {
+        key: 'slorber',
+        name: 'Sébastien Lorber',
+        imageURL: 'https://github.com/slorber.png',
+      },
+    ]);
+    expect(
+      getBlogPostAuthors({
+        frontMatter: {
+          authors: 'slorber',
+        },
+        authorsMap: {
+          slorber: {
+            name: 'Sébastien Lorber',
+            imageURL: '/img/slorber.png',
+          },
+        },
+        baseUrl: '/',
+      }),
+    ).toEqual([
+      {
+        key: 'slorber',
+        name: 'Sébastien Lorber',
+        imageURL: '/img/slorber.png',
+      },
+    ]);
+    expect(
+      getBlogPostAuthors({
+        frontMatter: {
+          authors: 'slorber',
+        },
+        authorsMap: {
+          slorber: {
+            name: 'Sébastien Lorber',
+            imageURL: '/img/slorber.png',
+          },
+        },
+        baseUrl: '/baseUrl',
+      }),
+    ).toEqual([
+      {
+        key: 'slorber',
+        name: 'Sébastien Lorber',
+        imageURL: '/baseUrl/img/slorber.png',
+      },
+    ]);
   });
 
   it('can read authors string[]', () => {
@@ -100,6 +185,7 @@ describe('getBlogPostAuthors', () => {
           slorber: {name: 'Sébastien Lorber', title: 'maintainer'},
           yangshun: {name: 'Yangshun Tay'},
         },
+        baseUrl: '/',
       }),
     ).toEqual([
       {key: 'slorber', name: 'Sébastien Lorber', title: 'maintainer'},
@@ -114,6 +200,7 @@ describe('getBlogPostAuthors', () => {
           authors: {name: 'Sébastien Lorber', title: 'maintainer'},
         },
         authorsMap: undefined,
+        baseUrl: '/',
       }),
     ).toEqual([{name: 'Sébastien Lorber', title: 'maintainer'}]);
   });
@@ -128,6 +215,7 @@ describe('getBlogPostAuthors', () => {
           ],
         },
         authorsMap: undefined,
+        baseUrl: '/',
       }),
     ).toEqual([
       {name: 'Sébastien Lorber', title: 'maintainer'},
@@ -153,6 +241,7 @@ describe('getBlogPostAuthors', () => {
           slorber: {name: 'Sébastien Lorber', title: 'maintainer'},
           yangshun: {name: 'Yangshun Tay', title: 'Yangshun title original'},
         },
+        baseUrl: '/',
       }),
     ).toEqual([
       {key: 'slorber', name: 'Sébastien Lorber', title: 'maintainer'},
@@ -173,6 +262,7 @@ describe('getBlogPostAuthors', () => {
           authors: 'slorber',
         },
         authorsMap: undefined,
+        baseUrl: '/',
       }),
     ).toThrowErrorMatchingInlineSnapshot(`
       "Can't reference blog post authors by a key (such as 'slorber') because no authors map file could be loaded.
@@ -187,6 +277,7 @@ describe('getBlogPostAuthors', () => {
           authors: 'slorber',
         },
         authorsMap: {},
+        baseUrl: '/',
       }),
     ).toThrowErrorMatchingInlineSnapshot(`
       "Can't reference blog post authors by a key (such as 'slorber') because no authors map file could be loaded.
@@ -205,6 +296,7 @@ describe('getBlogPostAuthors', () => {
           yangshun: {name: 'Yangshun Tay'},
           jmarcey: {name: 'Joel Marcey'},
         },
+        baseUrl: '/',
       }),
     ).toThrowErrorMatchingInlineSnapshot(`
       "Blog author with key "slorber" not found in the authors map file.
@@ -225,6 +317,7 @@ describe('getBlogPostAuthors', () => {
           yangshun: {name: 'Yangshun Tay'},
           jmarcey: {name: 'Joel Marcey'},
         },
+        baseUrl: '/',
       }),
     ).toThrowErrorMatchingInlineSnapshot(`
       "Blog author with key "slorber" not found in the authors map file.
@@ -245,6 +338,7 @@ describe('getBlogPostAuthors', () => {
           yangshun: {name: 'Yangshun Tay'},
           jmarcey: {name: 'Joel Marcey'},
         },
+        baseUrl: '/',
       }),
     ).toThrowErrorMatchingInlineSnapshot(`
       "Blog author with key "slorber" not found in the authors map file.
@@ -262,6 +356,7 @@ describe('getBlogPostAuthors', () => {
           author: 'Yangshun Tay',
         },
         authorsMap: undefined,
+        baseUrl: '/',
       }),
     ).toThrowErrorMatchingInlineSnapshot(`
       "To declare blog post authors, use the 'authors' front matter in priority.
@@ -275,6 +370,7 @@ describe('getBlogPostAuthors', () => {
           author_title: 'legacy title',
         },
         authorsMap: {slorber: {name: 'Sébastien Lorber'}},
+        baseUrl: '/',
       }),
     ).toThrowErrorMatchingInlineSnapshot(`
       "To declare blog post authors, use the 'authors' front matter in priority.
diff --git a/packages/docusaurus-plugin-content-blog/src/authors.ts b/packages/docusaurus-plugin-content-blog/src/authors.ts
index 4d8f7b90b3fb..c5fdad61ddfb 100644
--- a/packages/docusaurus-plugin-content-blog/src/authors.ts
+++ b/packages/docusaurus-plugin-content-blog/src/authors.ts
@@ -5,7 +5,7 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-import {getDataFileData} from '@docusaurus/utils';
+import {getDataFileData, normalizeUrl} from '@docusaurus/utils';
 import {Joi, URISchema} from '@docusaurus/utils-validation';
 import type {BlogContentPaths} from './types';
 import type {
@@ -68,17 +68,37 @@ export async function getAuthorsMap(params: {
 type AuthorsParam = {
   frontMatter: BlogPostFrontMatter;
   authorsMap: AuthorsMap | undefined;
+  baseUrl: string;
 };
 
+function normalizeImageUrl({
+  imageURL,
+  baseUrl,
+}: {
+  imageURL: string | undefined;
+  baseUrl: string;
+}) {
+  return imageURL?.startsWith('/')
+    ? normalizeUrl([baseUrl, imageURL])
+    : imageURL;
+}
+
 // Legacy v1/early-v2 front matter fields
 // We may want to deprecate those in favor of using only frontMatter.authors
-function getFrontMatterAuthorLegacy(
-  frontMatter: BlogPostFrontMatter,
-): Author | undefined {
+function getFrontMatterAuthorLegacy({
+  baseUrl,
+  frontMatter,
+}: {
+  baseUrl: string;
+  frontMatter: BlogPostFrontMatter;
+}): Author | undefined {
   const name = frontMatter.author;
   const title = frontMatter.author_title ?? frontMatter.authorTitle;
   const url = frontMatter.author_url ?? frontMatter.authorURL;
-  const imageURL = frontMatter.author_image_url ?? frontMatter.authorImageURL;
+  const imageURL = normalizeImageUrl({
+    imageURL: frontMatter.author_image_url ?? frontMatter.authorImageURL,
+    baseUrl,
+  });
 
   if (name || title || url || imageURL) {
     return {
@@ -148,14 +168,26 @@ ${Object.keys(authorsMap)
   return frontMatterAuthors.map(toAuthor);
 }
 
+function fixAuthorImageBaseURL(
+  authors: Author[],
+  {baseUrl}: {baseUrl: string},
+) {
+  return authors.map((author) => ({
+    ...author,
+    imageURL: normalizeImageUrl({imageURL: author.imageURL, baseUrl}),
+  }));
+}
+
 export function getBlogPostAuthors(params: AuthorsParam): Author[] {
-  const authorLegacy = getFrontMatterAuthorLegacy(params.frontMatter);
+  const authorLegacy = getFrontMatterAuthorLegacy(params);
   const authors = getFrontMatterAuthors(params);
 
+  const updatedAuthors = fixAuthorImageBaseURL(authors, params);
+
   if (authorLegacy) {
     // Technically, we could allow mixing legacy/authors front matter, but do we
     // really want to?
-    if (authors.length > 0) {
+    if (updatedAuthors.length > 0) {
       throw new Error(
         `To declare blog post authors, use the 'authors' front matter in priority.
 Don't mix 'authors' with other existing 'author_*' front matter. Choose one or the other, not both at the same time.`,
@@ -164,5 +196,5 @@ Don't mix 'authors' with other existing 'author_*' front matter. Choose one or t
     return [authorLegacy];
   }
 
-  return authors;
+  return updatedAuthors;
 }
diff --git a/packages/docusaurus-plugin-content-blog/src/blogUtils.ts b/packages/docusaurus-plugin-content-blog/src/blogUtils.ts
index 36028495381c..0a8d2a0e0b67 100644
--- a/packages/docusaurus-plugin-content-blog/src/blogUtils.ts
+++ b/packages/docusaurus-plugin-content-blog/src/blogUtils.ts
@@ -319,7 +319,7 @@ async function processBlogSourceFile(
     routeBasePath,
     tagsRouteBasePath,
   ]);
-  const authors = getBlogPostAuthors({authorsMap, frontMatter});
+  const authors = getBlogPostAuthors({authorsMap, frontMatter, baseUrl});
 
   return {
     id: slug,