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We examined the effects of narcissistic leadership on employees' knowledge sharing by analyzing the mediating role of organizational identification and the moderating role of collectivism. Using structural equation modeling and hierarchical regression we analyzed 228 sets of paired data obtained from employees and their immediate supervisors at organizations in China. We found that narcissistic leadership had a negative effect on knowledge sharing among our respondents, and that organizational identification fully mediated the relationship between narcissistic leadership and knowledge sharing. Moreover, collectivism positively moderated the relationship between narcissistic leadership and knowledge sharing. Implications for research and practice are discussed.