This chapter conducts a review of the extant international literature concerning the role and impact that leaders can have in situations of workplace bullying, emotional abuse and harassment. In particular, this chapter explores situations in which leaders may be the perpetrator of bullying-their leadership style may contribute, positively or negatively, to workplace bullying-and examines broader areas or forms of leadership that have been characterized as bullying behaviour. When discussing the leader as the perpetrator, this chapter explores both the various antecedents (individual level and situational) and outcomes associated with leaders enacting bullying behaviour. Various leadership styles, such as autocratic/authoritarian, laissez-faire, charismatic, destructive and ethical leadership, are reviewed in relation to their impact on interpersonal bullying between co-workers. Finally, this chapter briefly explores broader forms of leadership, such as human resource management (HRM), the organization and policy, for the role that these can have in enabling or deterring bullying. The chapter concludes with some discussion on the implications for policy and practice and areas for future research.