diff --git a/README.md b/README.md
index 3ec3cfc9..f2f4d457 100644
--- a/README.md
+++ b/README.md
@@ -58,6 +58,9 @@ RestClient::Connection* conn = new RestClient::Connection("http://url.com");
 // configure basic auth
 conn->SetBasicAuth("WarMachine68", "WARMACHINEROX");
 
+// to authenticate using the NTLM protocol
+conn->SetAuthProtocol( CURLAUTH_NTLM );
+
 // set connection timeout to 5s
 conn->SetTimeout(5);
 
diff --git a/include/restclient-cpp/connection.h b/include/restclient-cpp/connection.h
index 5f82c7c6..b1c17da7 100644
--- a/include/restclient-cpp/connection.h
+++ b/include/restclient-cpp/connection.h
@@ -160,6 +160,9 @@ class Connection {
     void SetBasicAuth(const std::string& username,
                       const std::string& password);
 
+    // Allow other authentication protocols to be used (such as NTLM)
+    void SetAuthProtocol( unsigned int proto ) { authProtocol = proto; }
+    
     // set connection timeout to seconds
     void SetTimeout(int seconds);
 
@@ -254,6 +257,7 @@ class Connection {
       std::string username;
       std::string password;
     } basicAuth;
+    unsigned long authProtocol = 0;
     std::string customUserAgent;
     std::string caInfoFilePath;
     RequestInfo lastRequest;
diff --git a/source/connection.cc b/source/connection.cc
index e0dcbb7a..bb9e2b2c 100644
--- a/source/connection.cc
+++ b/source/connection.cc
@@ -421,7 +421,8 @@ RestClient::Connection::performCurlRequest(const std::string& uri,
   if (this->basicAuth.username.length() > 0) {
     std::string authString = std::string(this->basicAuth.username + ":" +
                                          this->basicAuth.password);
-    curl_easy_setopt(getCurlHandle(), CURLOPT_HTTPAUTH, CURLAUTH_BASIC);
+    curl_easy_setopt(getCurlHandle(), CURLOPT_HTTPAUTH,
+              this->authProtocol == 0 ? CURLAUTH_BASIC : this->authProtocol);
     curl_easy_setopt(getCurlHandle(), CURLOPT_USERPWD, authString.c_str());
   }
   /** set error buffer */