In this study, the anti-fungal activity of some citrus essential oils and their components was evaluated. All essential oils inhibited the growth of Botrytis cinerea and Trichoderma viride. Penicillium digitatum was stimulated. Citral inhibited the growth of all tested fungi. (+) and (−) α- and β-pinenes displayed opposite stimulatory effects. (+) and (−) limonene and γ-terpinene stimulated the growth of Penicillium digitatum.