diff --git a/README.md b/README.md
index 595d6b6e..0ac1566e 100644
--- a/README.md
+++ b/README.md
@@ -90,6 +90,11 @@ const config = {
     appVersion: '0.1.0',
     appContactInfo: 'user@mail.org',
 
+    // Optional: OAuth Bearer access token for authenticated requests.
+    // Requires an HTTPS `baseUrl`. When set, `botAccount` is not needed.
+    // Submission scopes: `submit_isrc`, `submit_barcode`.
+    accessToken: 'eyJ...',
+
     // Optional: Proxy settings (default: no proxy server)
     proxy: {
         host: 'localhost',
diff --git a/lib/http-client.ts b/lib/http-client.ts
index 401261eb..f549317e 100644
--- a/lib/http-client.ts
+++ b/lib/http-client.ts
@@ -17,6 +17,10 @@ export interface IHttpClientOptions {
    */
   timeout: number;
   userAgent: string;
+  /**
+   * OAuth Bearer access token sent as the Authorization header.
+   */
+  accessToken?: string;
   followRedirects?: boolean;
 }
 
@@ -70,8 +74,13 @@ export class HttpClient {
     const url = this._buildUrl(path, options.query);
     const cookies = await this.getCookies();
 
-    const headers: HeadersInit = new Headers(options.headers);
+    const headers = new Headers(options.headers);
     headers.set('User-Agent', this.httpOptions.userAgent);
+
+    const existingAuth = headers.get('Authorization');
+    if (this.httpOptions.accessToken && (!existingAuth || existingAuth.trim() === '')) {
+      headers.set('Authorization', `Bearer ${this.httpOptions.accessToken}`);
+    }
     if (cookies !== null) {
       headers.set('Cookie', cookies);
     }
diff --git a/lib/musicbrainz-api-node.ts b/lib/musicbrainz-api-node.ts
index 2dd240d5..dc952303 100644
--- a/lib/musicbrainz-api-node.ts
+++ b/lib/musicbrainz-api-node.ts
@@ -17,11 +17,7 @@ export * from './http-client.js';
 export class MusicBrainzApi extends MusicBrainzApiDefault {
 
   protected initHttpClient(): HttpClientNode {
-    return new HttpClientNode({
-      baseUrl: this.config.baseUrl,
-      timeout: 500,
-      userAgent: `${this.config.appName}/${this.config.appVersion} ( ${this.config.appContactInfo} )`
-    });
+    return new HttpClientNode(this.getHttpClientOptions());
   }
 
   public async login(): Promise<boolean> {
diff --git a/lib/musicbrainz-api.ts b/lib/musicbrainz-api.ts
index d981f087..2fd613ce 100644
--- a/lib/musicbrainz-api.ts
+++ b/lib/musicbrainz-api.ts
@@ -5,7 +5,7 @@ import { DigestAuth } from './digest-auth.js';
 
 import { RateLimitThreshold } from 'rate-limit-threshold';
 import * as mb from './musicbrainz.types.js';
-import { HttpClient, type MultiQueryFormData } from "./http-client.js";
+import { HttpClient, type IHttpClientOptions, type MultiQueryFormData } from './http-client.js';
 
 export { XmlMetadata } from './xml/xml-metadata.js';
 export { XmlIsrc } from './xml/xml-isrc.js';
@@ -138,6 +138,11 @@ export interface IMusicBrainzConfig {
   appName?: string,
   appVersion?: string,
 
+  /**
+   * OAuth Bearer access token for authenticated requests.
+   */
+  accessToken?: string,
+
   /**
    * HTTP Proxy
    */
@@ -242,18 +247,31 @@ export class MusicBrainzApi {
       ..._config
     }
 
+    // RFC 6750 §5.3: Bearer tokens require TLS. Reject non-HTTPS baseUrl when
+    // an accessToken is configured to prevent token leakage over plain HTTP.
+    if (this.config.accessToken && !/^https:\/\//i.test(this.config.baseUrl)) {
+      throw new Error(
+        `MusicBrainzApi: 'accessToken' requires an HTTPS baseUrl (RFC 6750). Received baseUrl="${this.config.baseUrl}".`
+      );
+    }
+
     this.httpClient = this.initHttpClient();
 
     const limits = this.config.rateLimit ?? [15,18];
     this.rateLimiter = new RateLimitThreshold(limits[0], limits[1]);
   }
 
-  protected initHttpClient(): HttpClient {
-    return new HttpClient({
+  protected getHttpClientOptions(): IHttpClientOptions {
+    return {
       baseUrl: this.config.baseUrl,
       timeout: 500,
-      userAgent: `${this.config.appName}/${this.config.appVersion} ( ${this.config.appContactInfo} )`
-    });
+      userAgent: `${this.config.appName}/${this.config.appVersion} ( ${this.config.appContactInfo} )`,
+      accessToken: this.config.accessToken,
+    };
+  }
+
+  protected initHttpClient(): HttpClient {
+    return new HttpClient(this.getHttpClientOptions());
   }
 
   public async restGet<T>(relUrl: string, query: MultiQueryFormData = {}): Promise<T> {
@@ -426,14 +444,31 @@ export class MusicBrainzApi {
       throw new Error("XML-Post requires the appName & appVersion to be defined");
     }
 
+    // Require credentials before serializing XML or making a network request.
+    if (!this.config.accessToken && !this.config.botAccount) {
+      throw new Error("XML-Post requires either 'accessToken' or 'botAccount' credentials to be configured");
+    }
+
     const clientId = `${this.config.appName.replace(/-/g, '.')}-${this.config.appVersion}`;
 
     const path = `/ws/2/${entity}/`;
-    // Get digest challenge
+    const postData = xmlMetadata.toXml();
+
+    // With an OAuth Bearer token, HttpClient sets the Authorization header.
+    // Submit the body once; no digest-challenge retry is needed.
+    if (this.config.accessToken) {
+      await this.applyRateLimiter();
+      await this.httpClient.post(path, {
+        query: { client: clientId },
+        headers: { 'Content-Type': 'application/xml' },
+        body: postData
+      });
+      return;
+    }
 
+    // Get digest challenge
     let digest = '';
     let n = 1;
-    const postData = xmlMetadata.toXml();
 
     do {
       await this.applyRateLimiter();
diff --git a/test/test-musicbrainz-api.ts b/test/test-musicbrainz-api.ts
index 8a353a9b..8be0e3da 100644
--- a/test/test-musicbrainz-api.ts
+++ b/test/test-musicbrainz-api.ts
@@ -1356,6 +1356,166 @@ describe('MusicBrainz-api', function () {
 
   });
 
+
+  describe('OAuth Bearer token', () => {
+
+    afterEach(() => {
+      sinon.restore();
+    });
+
+    it('sends configured accessToken as Authorization Bearer header (default entrypoint)', async () => {
+      const accessToken = 'test-access-token';
+      const mbApi = new MusicBrainzApi(await makeSearchApiConfig({
+        accessToken,
+        disableRateLimiting: true
+      }));
+      const fetchStub = sinon.stub(globalThis, 'fetch').resolves(new Response('{}'));
+
+      await mbApi.restGet<IArtist>(`/artist/${mbid.artist.Stromae}`);
+
+      assert.isTrue(fetchStub.calledOnce);
+      const requestInit = fetchStub.firstCall.args[1] as RequestInit;
+      const headers = requestInit.headers as Headers;
+      assert.strictEqual(headers.get('Authorization'), `Bearer ${accessToken}`);
+    });
+
+
+    it('sends configured accessToken as Authorization Bearer header (node entrypoint)', async () => {
+      const accessToken = 'test-access-token';
+      const mbApi = new MusicBrainzApiNode(await makeSearchApiConfig({
+        accessToken,
+        disableRateLimiting: true
+      }));
+      const fetchStub = sinon.stub(globalThis, 'fetch').resolves(new Response('{}'));
+      await mbApi.restGet<IArtist>(`/artist/${mbid.artist.Stromae}`);
+      assert.isTrue(fetchStub.calledOnce);
+      const requestInit = fetchStub.firstCall.args[1] as RequestInit;
+      const headers = requestInit.headers as Headers;
+      assert.strictEqual(headers.get('Authorization'), `Bearer ${accessToken}`);
+    });
+
+
+    it('does not send Authorization header when accessToken is not configured', async () => {
+      const mbApi = new MusicBrainzApi(await makeSearchApiConfig({
+        disableRateLimiting: true
+      }));
+      const fetchStub = sinon.stub(globalThis, 'fetch').resolves(new Response('{}'));
+
+      await mbApi.restGet<IArtist>(`/artist/${mbid.artist.Stromae}`);
+
+      assert.isTrue(fetchStub.calledOnce);
+      const requestInit = fetchStub.firstCall.args[1] as RequestInit;
+      const headers = requestInit.headers as Headers;
+      assert.isFalse(headers.has('Authorization'));
+    });
+    it('does not overwrite a caller-provided non-empty Authorization header', async () => {
+      const accessToken = 'configured-token';
+      const mbApi = new MusicBrainzApi(await makeSearchApiConfig({
+        accessToken,
+        disableRateLimiting: true
+      }));
+      const fetchStub = sinon.stub(globalThis, 'fetch').resolves(new Response('{}'));
+
+      // Exercise override behavior via the underlying httpClient so we can
+      // pass a custom Authorization header directly.
+      const httpClient = (mbApi as unknown as { httpClient: HttpClient }).httpClient;
+      await httpClient.get('/ws/2/artist/' + mbid.artist.Stromae, {
+        headers: { Authorization: 'Bearer caller-supplied-token' }
+      });
+
+      assert.isTrue(fetchStub.calledOnce);
+      const requestInit = fetchStub.firstCall.args[1] as RequestInit;
+      const headers = requestInit.headers as Headers;
+      assert.strictEqual(
+        headers.get('Authorization'),
+        'Bearer caller-supplied-token',
+        'caller-provided Authorization header must not be overwritten by the configured accessToken'
+      );
+    });
+
+    it('overrides an empty Authorization header with the configured Bearer token', async () => {
+      const accessToken = 'configured-token';
+      const mbApi = new MusicBrainzApi(await makeSearchApiConfig({
+        accessToken,
+        disableRateLimiting: true
+      }));
+      const fetchStub = sinon.stub(globalThis, 'fetch').resolves(new Response('{}'));
+
+      const httpClient = (mbApi as unknown as { httpClient: HttpClient }).httpClient;
+      await httpClient.get('/ws/2/artist/' + mbid.artist.Stromae, {
+        headers: { Authorization: '   ' } // whitespace-only counts as empty
+      });
+
+      assert.isTrue(fetchStub.calledOnce);
+      const requestInit = fetchStub.firstCall.args[1] as RequestInit;
+      const headers = requestInit.headers as Headers;
+      assert.strictEqual(headers.get('Authorization'), `Bearer ${accessToken}`);
+    });
+
+    it('throws if accessToken is configured but baseUrl is not HTTPS', async () => {
+      const base = await makeSearchApiConfig({
+        accessToken: 'test-access-token',
+        baseUrl: 'http://musicbrainz.org', // intentionally non-HTTPS
+        disableRateLimiting: true
+      });
+      assert.throws(
+        () => new MusicBrainzApi(base),
+        /HTTPS baseUrl/
+      );
+    });
+
+    it('uses Bearer token for XML web-service post() and skips Digest challenge', async () => {
+      const accessToken = 'submit-isrc-token';
+      const mbApi = new MusicBrainzApi(await makeTestApiConfig({
+        accessToken,
+        disableRateLimiting: true,
+        // No botAccount required when accessToken is configured
+        botAccount: undefined
+      }));
+      const fetchStub = sinon.stub(globalThis, 'fetch').resolves(
+        new Response('', { status: 200 })
+      );
+
+      const xmlMetadata = new XmlMetadata();
+      const xmlRecording = xmlMetadata.pushRecording(mbid.recording.Formidable);
+      xmlRecording.isrcList.pushIsrc('BET671300161');
+
+      await mbApi.post('recording', xmlMetadata);
+
+      assert.isTrue(fetchStub.calledOnce, 'fetch should be called exactly once (no Digest retry)');
+      const [, requestInit] = fetchStub.firstCall.args;
+      const headers = (requestInit as RequestInit).headers as Headers;
+      assert.strictEqual(headers.get('Authorization'), `Bearer ${accessToken}`);
+      assert.strictEqual(headers.get('Content-Type'), 'application/xml');
+    });
+
+    it('post() throws when neither accessToken nor botAccount credentials are configured', async () => {
+      const mbApi = new MusicBrainzApi(await makeTestApiConfig({
+        disableRateLimiting: true,
+        botAccount: undefined
+      }));
+
+      const xmlMetadata = new XmlMetadata();
+      xmlMetadata.pushRecording(mbid.recording.Formidable);
+
+      // Stub fetch so an accidental network call would surface as a test failure
+      const fetchStub = sinon.stub(globalThis, 'fetch').resolves(new Response('', { status: 200 }));
+
+      let thrown: Error | undefined;
+      try {
+        await mbApi.post('recording', xmlMetadata);
+      } catch (err) {
+        thrown = err as Error;
+      }
+      assert.isDefined(thrown, 'post() should have thrown');
+      assert.match(
+        (thrown as Error).message,
+        /accessToken.*botAccount|botAccount.*accessToken/i
+      );
+      assert.isFalse(fetchStub.called, 'no HTTP request should be made without credentials');
+    });
+  });
+
   describe("Rate limiting", () => {
     let mbTestApiNoLimit: MusicBrainzApi;
     let mbTestApiLimit: MusicBrainzApi;
@@ -1546,6 +1706,54 @@ describe('Cover Art Archive API', function () {
 
 });
 
+/**
+ * OAuth-authenticated submissions via the XML web service through the Node
+ * entrypoint.
+ *
+ * The endpoints under `/ws/2/...` accept `Authorization: Bearer <token>`
+ */
+describe('Node specific API (OAuth)', () => {
+
+  afterEach(() => {
+    sinon.restore();
+  });
+
+  describe('ISRC submission via XML web service', () => {
+
+    it('uses Bearer token for post() (no botAccount required)', async () => {
+      const accessToken = 'submit-isrc-token';
+      const mbTestApi = new MusicBrainzApiNode(await makeTestApiConfig({
+        accessToken,
+        disableRateLimiting: true,
+        botAccount: undefined
+      }));
+      const fetchStub = sinon.stub(globalThis, 'fetch').resolves(
+        new Response('', { status: 200 })
+      );
+
+      const xmlMetadata = new XmlMetadata();
+      const xmlRecording = xmlMetadata.pushRecording('94fb868b-9233-4f9e-966b-e8036bf7461e');
+      xmlRecording.isrcList.pushIsrc('GB5EM1801762');
+
+      await mbTestApi.post('recording', xmlMetadata);
+
+      assert.isTrue(fetchStub.calledOnce, 'fetch should be called exactly once (no Digest retry)');
+      const [, requestInit] = fetchStub.firstCall.args;
+      const headers = (requestInit as RequestInit).headers as Headers;
+      assert.strictEqual(headers.get('Authorization'), `Bearer ${accessToken}`);
+      assert.strictEqual(headers.get('Content-Type'), 'application/xml');
+    });
+
+  });
+
+});
+
+/**
+ * Skipped: this suite drives the MusicBrainz website form flow
+ * (/login, /logout, /<entity>/<mbid>/edit), which authenticates with
+ * CSRF tokens, session cookies, and form-encoded username/password.
+ * These endpoints do not accept OAuth Bearer tokens.
+ */
 describe.skip('Node specific API', function () {
 
   let mbTestApi: MusicBrainzApiNode;