diff --git a/lib-es5/api_client/call_api.js b/lib-es5/api_client/call_api.js
index 01c0ba12..844199d0 100644
--- a/lib-es5/api_client/call_api.js
+++ b/lib-es5/api_client/call_api.js
@@ -12,11 +12,17 @@ var ensurePresenceOf = utils.ensurePresenceOf;
 function call_api(method, uri, params, callback, options) {
   ensurePresenceOf({ method, uri });
   var api_url = utils.base_api_url(uri, options);
-  var auth = {
-    key: ensureOption(options, "api_key"),
-    secret: ensureOption(options, "api_secret")
-  };
-
+  var auth = {};
+  if (options.oauth_token || config().oauth_token) {
+    auth = {
+      oauth_token: ensureOption(options, "oauth_token")
+    };
+  } else {
+    auth = {
+      key: ensureOption(options, "api_key"),
+      secret: ensureOption(options, "api_secret")
+    };
+  }
   return execute_request(method, params, auth, api_url, callback, options);
 }
 
diff --git a/lib-es5/api_client/execute_request.js b/lib-es5/api_client/execute_request.js
index d6e1abf7..a385fbd9 100644
--- a/lib-es5/api_client/execute_request.js
+++ b/lib-es5/api_client/execute_request.js
@@ -23,6 +23,7 @@ function execute_request(method, params, auth, api_url, callback) {
       handle_response = void 0; // declare to user later
   var key = auth.key;
   var secret = auth.secret;
+  var oauth_token = auth.oauth_token;
   var content_type = 'application/x-www-form-urlencoded';
 
   if (options.content_type === 'json') {
@@ -43,9 +44,15 @@ function execute_request(method, params, auth, api_url, callback) {
     headers: {
       'Content-Type': content_type,
       'User-Agent': utils.getUserAgent()
-    },
-    auth: key + ":" + secret
+    }
   });
+
+  if (oauth_token) {
+    request_options.headers.Authorization = `Bearer ${oauth_token}`;
+  } else {
+    request_options.auth = key + ":" + secret;
+  }
+
   if (options.agent != null) {
     request_options.agent = options.agent;
   }
diff --git a/lib-es5/uploader.js b/lib-es5/uploader.js
index f67cab4f..f45979a4 100644
--- a/lib-es5/uploader.js
+++ b/lib-es5/uploader.js
@@ -33,6 +33,7 @@ var https = isSecure ? require('https') : require('http');
 var Cache = require('./cache');
 var utils = require("./utils");
 var UploadStream = require('./upload_stream');
+var config = require("./config");
 
 var build_upload_params = utils.build_upload_params,
     extend = utils.extend,
@@ -558,7 +559,6 @@ function call_api(action, callback, options, get_params) {
 
     return Buffer.from(encodeFieldPart(boundary, key, value), 'utf8');
   });
-
   var result = post(api_url, post_data, boundary, file, handle_response, options);
   if (isObject(result)) {
     return result;
@@ -572,6 +572,7 @@ function call_api(action, callback, options, get_params) {
 function post(url, post_data, boundary, file, callback, options) {
   var file_header = void 0;
   var finish_buffer = Buffer.from("--" + boundary + "--", 'ascii');
+  var oauth_token = options.oauth_token || config().oauth_token;
   if (file != null || options.stream) {
     // eslint-disable-next-line no-nested-ternary
     var filename = options.stream ? options.filename ? options.filename : "file" : basename(file);
@@ -588,6 +589,10 @@ function post(url, post_data, boundary, file, callback, options) {
   if (options.x_unique_upload_id != null) {
     headers['X-Unique-Upload-Id'] = options.x_unique_upload_id;
   }
+  if (oauth_token != null) {
+    headers.Authorization = `Bearer ${oauth_token}`;
+  }
+
   post_options = extend(post_options, {
     method: 'POST',
     headers: headers
diff --git a/lib-es5/utils/index.js b/lib-es5/utils/index.js
index edbdb4c9..a9e330fa 100644
--- a/lib-es5/utils/index.js
+++ b/lib-es5/utils/index.js
@@ -1106,11 +1106,14 @@ function process_request_params(params, options) {
   if (options.unsigned != null && options.unsigned) {
     params = exports.clear_blank(params);
     delete params.timestamp;
+  } else if (options.oauth_token || config().oauth_token) {
+    params = exports.clear_blank(options);
   } else if (options.signature) {
     params = exports.clear_blank(options);
   } else {
     params = exports.sign_request(params, options);
   }
+
   return params;
 }
 
diff --git a/lib/api_client/call_api.js b/lib/api_client/call_api.js
index 99baac07..5b925ee7 100644
--- a/lib/api_client/call_api.js
+++ b/lib/api_client/call_api.js
@@ -9,11 +9,17 @@ const { ensurePresenceOf } = utils;
 function call_api(method, uri, params, callback, options) {
   ensurePresenceOf({ method, uri });
   const api_url = utils.base_api_url(uri, options);
-  const auth = {
-    key: ensureOption(options, "api_key"),
-    secret: ensureOption(options, "api_secret")
-  };
-
+  let auth = {};
+  if (options.oauth_token || config().oauth_token){
+    auth = {
+      oauth_token: ensureOption(options, "oauth_token")
+    };
+  } else {
+    auth = {
+      key: ensureOption(options, "api_key"),
+      secret: ensureOption(options, "api_secret")
+    };
+  }
   return execute_request(method, params, auth, api_url, callback, options);
 }
 
diff --git a/lib/api_client/execute_request.js b/lib/api_client/execute_request.js
index 00b1cae9..e88b746f 100644
--- a/lib/api_client/execute_request.js
+++ b/lib/api_client/execute_request.js
@@ -16,6 +16,7 @@ function execute_request(method, params, auth, api_url, callback, options = {})
   let query_params, handle_response; // declare to user later
   let key = auth.key;
   let secret = auth.secret;
+  let oauth_token = auth.oauth_token;
   let content_type = 'application/x-www-form-urlencoded';
 
   if (options.content_type === 'json') {
@@ -36,9 +37,15 @@ function execute_request(method, params, auth, api_url, callback, options = {})
     headers: {
       'Content-Type': content_type,
       'User-Agent': utils.getUserAgent()
-    },
-    auth: key + ":" + secret
+    }
   });
+
+  if (oauth_token) {
+    request_options.headers.Authorization = `Bearer ${oauth_token}`;
+  } else {
+    request_options.auth = key + ":" + secret
+  }
+
   if (options.agent != null) {
     request_options.agent = options.agent;
   }
diff --git a/lib/uploader.js b/lib/uploader.js
index e68081e2..698db098 100644
--- a/lib/uploader.js
+++ b/lib/uploader.js
@@ -13,6 +13,7 @@ const https = isSecure ? require('https') : require('http');
 const Cache = require('./cache');
 const utils = require("./utils");
 const UploadStream = require('./upload_stream');
+const config = require("./config");
 
 const {
   build_upload_params,
@@ -459,7 +460,6 @@ function call_api(action, callback, options, get_params) {
     .map(
       ([key, value]) => Buffer.from(encodeFieldPart(boundary, key, value), 'utf8')
     );
-
   let result = post(api_url, post_data, boundary, file, handle_response, options);
   if (isObject(result)) {
     return result;
@@ -473,6 +473,7 @@ function call_api(action, callback, options, get_params) {
 function post(url, post_data, boundary, file, callback, options) {
   let file_header;
   let finish_buffer = Buffer.from("--" + boundary + "--", 'ascii');
+  let oauth_token = options.oauth_token || config().oauth_token;
   if ((file != null) || options.stream) {
     // eslint-disable-next-line no-nested-ternary
     let filename = options.stream ? options.filename ? options.filename : "file" : basename(file);
@@ -489,6 +490,10 @@ function post(url, post_data, boundary, file, callback, options) {
   if (options.x_unique_upload_id != null) {
     headers['X-Unique-Upload-Id'] = options.x_unique_upload_id;
   }
+  if (oauth_token != null) {
+    headers.Authorization = `Bearer ${oauth_token}`;
+  }
+
   post_options = extend(post_options, {
     method: 'POST',
     headers: headers
diff --git a/lib/utils/index.js b/lib/utils/index.js
index 3170346d..882030f4 100644
--- a/lib/utils/index.js
+++ b/lib/utils/index.js
@@ -1017,11 +1017,14 @@ function process_request_params(params, options) {
   if ((options.unsigned != null) && options.unsigned) {
     params = exports.clear_blank(params);
     delete params.timestamp;
+  } else if (options.oauth_token || config().oauth_token) {
+    params = exports.clear_blank(options);
   } else if (options.signature) {
     params = exports.clear_blank(options);
   } else {
     params = exports.sign_request(params, options);
   }
+
   return params;
 }
 
diff --git a/test/integration/api/authorization/oAuth_authorization_spec.js b/test/integration/api/authorization/oAuth_authorization_spec.js
new file mode 100644
index 00000000..6cc2283a
--- /dev/null
+++ b/test/integration/api/authorization/oAuth_authorization_spec.js
@@ -0,0 +1,128 @@
+const sinon = require('sinon');
+const cloudinary = require("../../../../cloudinary");
+const helper = require("../../../spechelper");
+const describe = require('../../../testUtils/suite');
+const testConstants = require('../../../testUtils/testConstants');
+const { PUBLIC_IDS } = testConstants;
+const { PUBLIC_ID } = PUBLIC_IDS;
+
+describe("oauth_token", function(){
+  it("should send the oauth_token option to the server (admin_api)", function() {
+    return helper.provideMockObjects((mockXHR, writeSpy, requestSpy) => {
+      cloudinary.v2.api.resource(PUBLIC_ID, { oauth_token: 'MTQ0NjJkZmQ5OTM2NDE1ZTZjNGZmZjI4' });
+      return sinon.assert.calledWith(requestSpy,
+        sinon.match.has("headers",
+          sinon.match.has("Authorization", "Bearer MTQ0NjJkZmQ5OTM2NDE1ZTZjNGZmZjI4")
+        ));
+    });
+  });
+
+  it("should send the oauth_token config to the server (admin_api)", function() {
+    return helper.provideMockObjects((mockXHR, writeSpy, requestSpy) => {
+      cloudinary.config({
+        api_key: undefined,
+        api_secret: undefined,
+        oauth_token: 'MTQ0NjJkZmQ5OTM2NDE1ZTZjNGZmZjI4'
+      });
+      cloudinary.v2.api.resource(PUBLIC_ID);
+      return sinon.assert.calledWith(requestSpy,
+        sinon.match.has("headers",
+          sinon.match.has("Authorization", "Bearer MTQ0NjJkZmQ5OTM2NDE1ZTZjNGZmZjI4")
+        ));
+    });
+  });
+
+  it("should not fail when only providing api_key and secret (admin_api)", function() {
+    cloudinary.config({
+      api_key: "1234",
+      api_secret: "1234",
+      oauth_token: undefined
+    });
+    return helper.provideMockObjects((mockXHR, writeSpy, requestSpy) => {
+      cloudinary.v2.api.resource(PUBLIC_ID);
+      return sinon.assert.calledWith(requestSpy, sinon.match({ auth: "1234:1234" }));
+    });
+  });
+
+  it("should fail when missing all credentials (admin_api)", function() {
+    cloudinary.config({
+      api_key: undefined,
+      api_secret: undefined,
+      oauth_token: undefined
+    });
+    expect(() => {
+      cloudinary.v2.api.resource(PUBLIC_ID)
+    }).to.throwError(/Must supply api_key/);
+  });
+
+  it("oauth_token as option should take priority with secret and key (admin_api)", function() {
+    cloudinary.config({
+      api_key: '1234',
+      api_secret: '1234'
+    });
+    return cloudinary.v2.api.resource(PUBLIC_ID, {oauth_token: 'MTQ0NjJkZmQ5OTM2NDE1ZTZjNGZmZjI4'})
+      .then(
+        () => expect().fail()
+      ).catch(({ error }) => expect(error.message).to.contain("Invalid token"));
+  });
+
+  it("should send the oauth_token option to the server (upload_api)", function() {
+    return helper.provideMockObjects((mockXHR, writeSpy, requestSpy) => {
+      cloudinary.v2.uploader.upload(PUBLIC_ID, { oauth_token: 'MTQ0NjJkZmQ5OTM2NDE1ZTZjNGZmZjI4' });
+      return sinon.assert.calledWith(requestSpy,
+        sinon.match.has("headers",
+          sinon.match.has("Authorization", "Bearer MTQ0NjJkZmQ5OTM2NDE1ZTZjNGZmZjI4")
+        ));
+    });
+  });
+
+  it("should send the oauth_token config to the server (upload_api)", function() {
+    return helper.provideMockObjects((mockXHR, writeSpy, requestSpy) => {
+      cloudinary.config({
+        api_key: undefined,
+        api_secret: undefined,
+        oauth_token: 'MTQ0NjJkZmQ5OTM2NDE1ZTZjNGZmZjI4'
+      });
+      cloudinary.v2.uploader.upload(PUBLIC_ID);
+      return sinon.assert.calledWith(requestSpy,
+        sinon.match.has("headers",
+          sinon.match.has("Authorization", "Bearer MTQ0NjJkZmQ5OTM2NDE1ZTZjNGZmZjI4")
+        ));
+    });
+  });
+
+  it("should not fail when only providing api_key and secret (upload_api)", function() {
+    cloudinary.config({
+      api_key: "1234",
+      api_secret: "1234",
+      oauth_token: undefined
+    });
+    return helper.provideMockObjects((mockXHR, writeSpy, requestSpy) => {
+      cloudinary.v2.uploader.upload(PUBLIC_ID)
+      return sinon.assert.calledWith(requestSpy, sinon.match({ auth: null }));
+    });
+  });
+
+  it("should fail when missing all credentials (upload_api)", function() {
+    cloudinary.config({
+      api_key: undefined,
+      api_secret: undefined,
+      oauth_token: undefined
+    });
+    expect(() => {
+      cloudinary.v2.uploader.upload(PUBLIC_ID)
+    }).to.throwError(/Must supply api_key/);
+  });
+
+  it("should not need credentials for unsigned upload", function() {
+    cloudinary.config({
+      api_key: undefined,
+      api_secret: undefined,
+      oauth_token: undefined
+    });
+    return helper.provideMockObjects((mockXHR, writeSpy, requestSpy) => {
+      cloudinary.v2.uploader.unsigned_upload(PUBLIC_ID, 'preset')
+      return sinon.assert.calledWith(requestSpy, sinon.match({ auth: null }));
+    });
+  });
+});
diff --git a/types/index.d.ts b/types/index.d.ts
index 677339cd..b581f560 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -342,6 +342,7 @@ declare module 'cloudinary' {
         account_id?: string;
         provisioning_api_key?: string;
         provisioning_api_secret?: string;
+        oauth_token?: string;
 
         [futureKey: string]: any;
     }
@@ -387,6 +388,7 @@ declare module 'cloudinary' {
     export interface AdminApiOptions {
         agent?: object;
         content_type?: string;
+        oauth_token?: string;
 
         [futureKey: string]: any;
     }
@@ -509,6 +511,7 @@ declare module 'cloudinary' {
         use_filename?: boolean;
         chunk_size?: number;
         disable_promises?: boolean;
+        oauth_token?: string;
 
         [futureKey: string]: any;
     }