Techniques for actor and thread message dispatching are described herein. In some examples, a computing system may include multiple actors and multiple processing threads. Upon receiving an incoming message associated with one of the actors, a dispatching component may select one of the multiple processing threads within the computing system to which to dispatch the message for processing. If the associated actor is already assigned to one of the processing threads, then that processing thread may be selected for processing of the message. By contrast, if the associated actor is not already assigned to one of the processing threads, then a processing thread may be selected based on various factors, such as a set of priorities associated with the processing threads.