Existing research has frequently linked affective organisational commitment with organisational citizenship behaviour. This cross-sectional study aimed to investigate the moderating role of each of the big five personality dimensions on this relationship to fill a perceived gap in the literature. As hypothesised, a Pearson correlation coefficient revealed that affective organisational commitment was positively correlated with organisational citizenship behaviour. A moderated hierarchical multiple regression analysis using standardised variables revealed that, as hypothesised, emotional stability acted as a moderator, while extraversion and intellect/imagination did not. Contrary to what was hypothesised, conscientiousness and agreeableness were found not to moderate the relationship between affective organisational commitment and organisational citizenship behaviour.