Rare research was undertaken to investigate the effect of leadership styles on employee organizational citizenship behaviour and knowledge sharing in the hospitality context. Drawing on the social exchange theory, the Luxor hotels' employees and their supervisors were engaged in a study which aims to investigate the impact of trust in supervisor on employee organizational citizenship behaviour and knowledge sharing. With a sample of 360 employee-supervisor dyads, the construct validity and reliability were ensured, and the findings of the structural equation model supported the impact of trust in supervisor on both organizational citizenship behaviour and knowledge sharing. Practically, this paper provided some managerial implications to encourage employees' organizational citizenship behaviour and knowledge sharing in the Egypt hospitality industry. For instance, the current paper recommends for Human Resources Directors to engage the candidates of managerial positions in the diagnostic survey of the trusty supervisor behaviour and use the results of this survey as selection criteria.