diff --git a/Network/AMQP.hs b/Network/AMQP.hs
--- a/Network/AMQP.hs
+++ b/Network/AMQP.hs
@@ -117,6 +117,8 @@
 
     ackMsg,
     ackEnv,
+    nackMsg,
+    nackEnv,
 
     -- * Transactions
     txSelect,
@@ -479,6 +481,24 @@
 ackEnv :: Envelope -> IO ()
 ackEnv env = ackMsg (envChannel env) (envDeliveryTag env) False
 
+{- | @nackMsg chan deliveryTag multiple requeue@ rejects one or more messages. A message MUST not be rejected more than once.
+
+if @multiple==True@, the @deliverTag@ is treated as \"up to and including\", so that the client can reject multiple messages with a single method call. If @multiple==False@, @deliveryTag@ refers to a single message.
+
+If @requeue==True@, the server will try to requeue the message. If @requeue==False@, the message will be dropped by the server.
+-}
+nackMsg :: Channel -> LongLongInt -> Bool -> Bool -> IO ()
+nackMsg chan deliveryTag multiple requeue =
+    writeAssembly chan $ (SimpleMethod (Basic_nack
+        deliveryTag -- delivery_tag
+        multiple -- multiple
+        requeue -- requeue
+        ))
+
+-- | Reject a single message. This is a wrapper for 'nackMsg' in case you have the 'Envelope' at hand.
+nackEnv :: Envelope -> IO ()
+nackEnv env = nackMsg (envChannel env) (envDeliveryTag env) False False
+
 -- | @rejectMsg chan deliveryTag requeue@ allows a client to reject a message. It can be used to interrupt and cancel large incoming messages, or return untreatable  messages to their original queue. If @requeue==False@, the message will be discarded.  If it is 'True', the server will attempt to requeue the message.
 --
 -- NOTE: RabbitMQ 1.7 doesn't implement this command
@@ -689,4 +709,3 @@
         uid   = if null uid'      then "guest" else uid'
         pw    = if null pw'       then "guest" else pw'
         host  = if null hst'      then "localhost" else hst'
-
diff --git a/amqp.cabal b/amqp.cabal
--- a/amqp.cabal
+++ b/amqp.cabal
@@ -1,5 +1,5 @@
 Name:                amqp
-Version:             0.19.0
+Version:             0.19.1
 Synopsis:            Client library for AMQP servers (currently only RabbitMQ)
 Description:         Client library for AMQP servers (currently only RabbitMQ)
 License:             BSD3
diff --git a/changelog.md b/changelog.md
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,7 @@
+### Version 0.19.1
+
+* add `nackMsg` and `nackEnv` methods
+
 ### Version 0.19.0
 
 * change `FVString` to be binary instead of UTF-8 encoded