diff --git a/packages/react-native/Libraries/Blob/URL.js b/packages/react-native/Libraries/Blob/URL.js
index 8386cc6d979d..09daa80a3c14 100644
--- a/packages/react-native/Libraries/Blob/URL.js
+++ b/packages/react-native/Libraries/Blob/URL.js
@@ -63,6 +63,66 @@ function validateBaseUrl(url: string) {
   );
 }
 
+function removeDotSegments(path: string): string {
+  const segments = path.split('/');
+  const output: Array<string> = [];
+  for (const segment of segments) {
+    if (segment === '..') {
+      if (output.length > 1) {
+        output.pop();
+      }
+    } else if (segment !== '.') {
+      output.push(segment);
+    }
+  }
+  const last = segments[segments.length - 1];
+  if (last === '.' || last === '..') {
+    output.push('');
+  }
+  return output.join('/');
+}
+
+function resolveReference(url: string, base: string): string {
+  if (/^[a-zA-Z][a-zA-Z\d+\-.]*:/.test(url)) {
+    return url;
+  }
+  const baseMatch = base.match(
+    /^([a-zA-Z][a-zA-Z\d+\-.]*:)?(\/\/[^/?#]*)?([^?#]*)(\?[^#]*)?/,
+  );
+  const refMatch = url.match(/^(\/\/[^/?#]*)?([^?#]*)(\?[^#]*)?(#.*)?$/);
+  if (baseMatch == null || refMatch == null) {
+    return url;
+  }
+  const scheme = baseMatch[1] ?? '';
+  const baseAuthority = baseMatch[2];
+  const basePath = baseMatch[3];
+  const baseQuery = baseMatch[4] ?? '';
+  const [, refAuthority, refPath, refQuery, refFragment] = refMatch;
+
+  let authority = baseAuthority ?? '';
+  let path;
+  let query = refQuery ?? '';
+  if (refAuthority != null) {
+    authority = refAuthority;
+    path = removeDotSegments(refPath);
+  } else if (refPath === '') {
+    path = basePath;
+    query = refQuery ?? baseQuery;
+  } else if (refPath.startsWith('/')) {
+    path = removeDotSegments(refPath);
+  } else if (baseAuthority != null && basePath === '') {
+    path = removeDotSegments(`/${refPath}`);
+  } else {
+    path = removeDotSegments(
+      basePath.slice(0, basePath.lastIndexOf('/') + 1) + refPath,
+    );
+  }
+  if (authority !== '' && path === '') {
+    path = '/';
+  }
+  return `${scheme}${authority}${path}${query}${refFragment ?? ''}`;
+}
+
 export class URL {
   _url: string;
   _searchParamsInstance: ?URLSearchParams = null;
@@ -81,7 +141,11 @@ export class URL {
   // $FlowFixMe[missing-local-annot]
   constructor(url: string, base?: string | URL) {
     let baseUrl = null;
-    if (base == null || base === '' || validateBaseUrl(url)) {
+    if (
+      base == null ||
+      base === '' ||
+      (validateBaseUrl(url) && !url.startsWith('//'))
+    ) {
       this._url = url;
       if (this._url.includes('#')) {
         const split = this._url.split('#');
@@ -111,17 +175,7 @@ export class URL {
       } else {
         baseUrl = base.toString();
       }
-      if (baseUrl.endsWith('/')) {
-        baseUrl = baseUrl.slice(0, baseUrl.length - 1);
-      }
-      let path = url;
-      if (!path.startsWith('/')) {
-        path = `/${path}`;
-      }
-      if (baseUrl.endsWith(path)) {
-        path = '';
-      }
-      this._url = `${baseUrl}${path}`;
+      this._url = resolveReference(url, baseUrl);
     }
   }
 
diff --git a/packages/react-native/Libraries/Blob/__tests__/URL-itest.js b/packages/react-native/Libraries/Blob/__tests__/URL-itest.js
index a8366268df4f..865c6bc7d0c6 100644
--- a/packages/react-native/Libraries/Blob/__tests__/URL-itest.js
+++ b/packages/react-native/Libraries/Blob/__tests__/URL-itest.js
@@ -25,12 +25,11 @@ describe('URL', function () {
     expect(d.href).toBe('https://developer.mozilla.org/en-US/docs');
     const f = new URL('/en-US/docs', d);
     expect(f.href).toBe('https://developer.mozilla.org/en-US/docs');
-    // from original test suite, but requires complex implementation
-    // const g = new URL(
-    //   '/en-US/docs',
-    //   'https://developer.mozilla.org/fr-FR/toto',
-    // );
-    // expect(g.href).toBe('https://developer.mozilla.org/en-US/docs');
+    const g = new URL(
+      '/en-US/docs',
+      'https://developer.mozilla.org/fr-FR/toto',
+    );
+    expect(g.href).toBe('https://developer.mozilla.org/en-US/docs');
     const h = new URL('/en-US/docs', a);
     expect(h.href).toBe('https://developer.mozilla.org/en-US/docs');
     const i = new URL('http://github.com', 'http://google.com');
@@ -161,6 +160,61 @@ describe('URL', function () {
       'https://example.com/path/to/resource',
     );
   });
+  it('resolves a network-path reference with the scheme of the base URL', () => {
+    expect(new URL('//cdn.example.com/x.js', 'https://example.com/').href).toBe(
+      'https://cdn.example.com/x.js',
+    );
+  });
+
+  it('resolves the RFC 3986 reference examples against a base URL', () => {
+    const base = 'http://a.com/b/c/d;p?q';
+    const cases = [
+      ['g:h', 'g:h'],
+      ['g', 'http://a.com/b/c/g'],
+      ['./g', 'http://a.com/b/c/g'],
+      ['g/', 'http://a.com/b/c/g/'],
+      ['/g', 'http://a.com/g'],
+      ['//g', 'http://g/'],
+      ['?y', 'http://a.com/b/c/d;p?y'],
+      ['g?y', 'http://a.com/b/c/g?y'],
+      ['#s', 'http://a.com/b/c/d;p?q#s'],
+      ['g#s', 'http://a.com/b/c/g#s'],
+      ['g?y#s', 'http://a.com/b/c/g?y#s'],
+      [';x', 'http://a.com/b/c/;x'],
+      ['g;x', 'http://a.com/b/c/g;x'],
+      ['g;x?y#s', 'http://a.com/b/c/g;x?y#s'],
+      ['', 'http://a.com/b/c/d;p?q'],
+      ['.', 'http://a.com/b/c/'],
+      ['./', 'http://a.com/b/c/'],
+      ['..', 'http://a.com/b/'],
+      ['../', 'http://a.com/b/'],
+      ['../g', 'http://a.com/b/g'],
+      ['../..', 'http://a.com/'],
+      ['../../', 'http://a.com/'],
+      ['../../g', 'http://a.com/g'],
+      ['../../../g', 'http://a.com/g'],
+      ['../../../../g', 'http://a.com/g'],
+      ['/./g', 'http://a.com/g'],
+      ['/../g', 'http://a.com/g'],
+      ['g.', 'http://a.com/b/c/g.'],
+      ['.g', 'http://a.com/b/c/.g'],
+      ['g..', 'http://a.com/b/c/g..'],
+      ['..g', 'http://a.com/b/c/..g'],
+      ['./../g', 'http://a.com/b/g'],
+      ['./g/.', 'http://a.com/b/c/g/'],
+      ['g/./h', 'http://a.com/b/c/g/h'],
+      ['g/../h', 'http://a.com/b/c/h'],
+      ['g;x=1/./y', 'http://a.com/b/c/g;x=1/y'],
+      ['g;x=1/../y', 'http://a.com/b/c/y'],
+      ['g?y/./x', 'http://a.com/b/c/g?y/./x'],
+      ['g?y/../x', 'http://a.com/b/c/g?y/../x'],
+      ['g#s/./x', 'http://a.com/b/c/g#s/./x'],
+      ['g#s/../x', 'http://a.com/b/c/g#s/../x'],
+    ];
+    for (const [reference, expected] of cases) {
+      expect(new URL(reference, base).href).toBe(expected);
+    }
+  });
 });
 
 describe('URLSearchParams.sort', () => {