Many empirical studies have tried to investigate the relationship between knowledge management (KM) leadership and organisational performance; however, the findings of such studies have been inconsistent. In response to this, we apply a meta-analysis technique to systematically assess the existing pool of empirical research results and derive conclusions. We also examine the impacts of contextual moderators, such as national culture, economy, and industry, on the KM leadershiporganisational performance relationships. The findings, stemming from 6,272 research subjects making up 22 studies, demonstrate that KM leadership is positively associated with the overall (financial and non-financial) performance of firms. Specifically, it was found that the KM leadership-non-financial performance relationship is strengthened in collective cultures, developing economies, and the manufacturing industry. This paper is the first meta-analytic study concerning KM leadership and organisational performance, producing new understanding of contextual factors in the KM field.