diff --git a/src/clj_http/core.clj b/src/clj_http/core.clj
index fc9bc595..5e668ff7 100644
--- a/src/clj_http/core.clj
+++ b/src/clj_http/core.clj
@@ -11,7 +11,9 @@
                             HttpEntityEnclosingRequest
                             HttpResponse Header HttpHost
                             HttpResponseInterceptor)
-           (org.apache.http.auth UsernamePasswordCredentials AuthScope)
+           (org.apache.http.auth AuthScope
+                                 UsernamePasswordCredentials
+                                 NTCredentials)
            (org.apache.http.params CoreConnectionPNames)
            (org.apache.http.client HttpClient HttpRequestRetryHandler)
            (org.apache.http.client.methods HttpDelete
@@ -211,7 +213,8 @@
   [{:keys [request-method scheme server-name server-port uri query-string
            headers body multipart socket-timeout conn-timeout proxy-host
            proxy-ignore-hosts proxy-port as cookie-store retry-handler
-           response-interceptor digest-auth connection-manager client-params]
+           response-interceptor digest-auth ntlm-auth auth-schemes 
+           connection-manager client-params]
     :as req}]
   (let [^ClientConnectionManager conn-mgr
         (or connection-manager
@@ -241,6 +244,17 @@
        (.getCredentialsProvider http-client)
        (AuthScope. nil -1 nil)
        (UsernamePasswordCredentials. user pass)))
+
+    (when-let [[user pass host domain] ntlm-auth]
+      (.setCredentials
+        (.getCredentialsProvider http-client)
+        (AuthScope. nil -1 nil)
+        (NTCredentials. user pass host domain)))
+
+    (doseq [[policy scheme-factory] auth-schemes]
+      (-> (.getAuthSchemes http-client)
+          (.register policy scheme-factory)))
+
     (let [http-url (str scheme "://" server-name
                         (when server-port (str ":" server-port))
                         uri