Humans recognise and respond to robots as social agents, to such extent that they occasionally a empt to bully a robot. e current paper investigates whether aggressive behaviour directed towards robots is in uenced by the same social processes that guide human bullying behaviour. More speci cally, it measured the e ects of dehumanisation primes and anthropomorphic qualities of the robot on participants' verbal abuse of a virtual robotic agents. Contrary to previous ndings in human-human interaction, priming participants with power did not result in less mind a ribution. However, evidence for dehumanisation was still found, as the less mind participants a ributed to the robot, the more aggressive responses they gave. In the main study this e ect was moderated by the manipulations of power and robot anthropomorphism; the low anthropomorphic robot in the power prime condition endured signi cantly less abuse, and mind a ribution remained a signi cant predictor for verbal aggression in all conditions save the low anthropomorphic robot with no prime. It is concluded that dehumanisation occurs in human-robot interaction and that like in human-human interaction, it is linked to aggressive behaviour. Moreover, it is argued that this dehumanisation is di erent from anthropomorphism as well as human-human dehumanisation, since anthropomorphism itself did not predict aggressive behaviour and dehumanisation of robots was not in uenced by primes that have been established in human-human dehumanisation research.