This paper examines the mediating effect of citizenship behaviour on the relationship between employee commitment and intent to leave at the organisational level. Two field studies involving three independent samples were conducted. The procedure used by Baron and Kenny (1986) was selected for the purposes of the mediation test. In study 1 (N = 704), the findings indicate a partial mediation of citizenship behaviour in the relationship between employee commitment and intent to leave the organisation. In study 2, the data show the same pattern in both sample A (N = 651) and sample B (N = 355). While sportsmanship was found to play a mediating role between employee commitment and intent to leave the organisation, no mediation was found for civic virtue. The findings are discussed.