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map.get(key).remove(value)should do the trick as long as you leave the empty queue there as a placeholder when you remove a key and catch the exception if it's not there (including the NPE off of get). If you can't leave the queue as a placeholder, then it's difficult to ensure safety unless you do lock the entire map while you clean out the cruft.akka.util.ConcurrentMultiMap. Thanks a lot, Viktor!