This research examines the impact of leadership development on organisational citizenship behaviour and social capital. This research involves a training intervention using Self-Determination Theory. According to Self-Determination Theory people are more content and engaged when their three basic psychological needs for autonomy, relatedness and competence are satisfied. Self-Determination Theory has also been associated with improvements in Organisational Citizenship Behaviour and Social Capital, which have been explained to significantly contribute to organisational effectiveness and performance. By training leaders how to satisfy the three basic psychological needs among their direct reports, this study will attempt to offer organisations a new way to cultivate organisational citizenship behaviour and social capital among organisational members.