While the influence of maternal interrole conflict on marital functioning has been investigated, the issue of fathers' interrole conflict has been neglected. Consequently, 67 fathers' (M age = 38.51 years) interrole conflict and marital adjustment are investigated. In addition, the moderating role of personality hardiness is assessed. Using multiple moderator regression and sub-group analyses, hardiness was shown to moderate negative effects of interrole conflict on marital adjustment. Conceptual and practical implications of these findings are discussed.