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The purpose of this study is to investigate the effect of competitive work environment on openness to knowledge sharing. A conceptual model, drawing on the existing literature, is developed to analyze how a competitive work environment contributes to openness to sharing knowledge among employees in organizations. The conceptual model includes coworker desire to learn as a mediating variable and incentives to knowledge sharing and job security as moderating variables. Data collected from eight banks with a total of 237 employees is used to test the research hypotheses using structural equation modelling techniques. The results show that coworker desire to learn mediates the relationship between competitive work environment and openness to knowledge sharing, and both incentives to knowledge sharing and job security moderate the effect of competitive work environment on openness to knowledge sharing. We make theoretical and practical contributions in knowledge management by showing the mechanism through which competitive work environment contributes to openness to share knowledge in organizations.