Purpose: Two psychological models, the theory of reasoned action (TRA) and the theory of planned behaviour (TPB) are the most common theories used to understand knowledge sharing behaviour. However, the empirical results are inconclusive on whether TRA and TPB can provide reasonable prediction of knowledge sharing attitude, intention and behaviour. Therefore, the purpose of this study is to conduct a review of these models in knowledge sharing. Design/methodology/approach: This study reviews 63 papers to provide a comprehensive picture of these models in knowledge sharing. Findings: Two main trends of modification were shown in the studies examining these models. Research gaps were identified as a guideline for future researchers to investigate potential moderators and examine these models from the participants’ perspective. Originality/value: The model serves as a roadmap for future researchers and managers considering their strategy to enhance knowledge sharing.