This paper includes a meta-analysis of 144 papers which considers the relationship between leadership (constructs such as transformational leadership, relations-orientated leadership, task-orientated leadership, destructive leadership and leader-member exchange), followers’ mental health and job performance. The authors consider six aspects of positive and negative followers’ mental health related outcomes; affective symptoms, burnout, stress, wellbeing, psychological functioning, and health complaints. The results of the meta-analysis suggests that some leadership constructs, specifically, transformational leadership, high quality relations-oriented and task-oriented leadership behaviour, as well as high quality leader-follower interactions were positively associated with mental health. Conversely, destructive leadership had a strong, negative association with mental health related outcomes. Additionally, there was some support for the indirect impact of leadership on employee performance, which was mediated by employee mental health (i.e. leadership affects employee mental health, which in turn affects employee performance).