The paper presents list of 44 species from 11 families of Lepidoptera found on the Croatian island of Mljet in July and August 2006. The research took place mainly in the Mljet National Park in the western part of the island. Isturgia arenacearia (Den. & Schiff.) and Nola chlamitulalis (Hübn.) are two species from the list which were previously recorded in Croatia only for a few times.Rad donosi popis 44 vrste iz 11 porodica leptira zabilježenih na otoku Mljetu u srpnju i kolovozu 2006. godine. Istraživanje se uglavnom obavljalo na području NP Mljet na zapadnom dijelu otoka. Vrste Isturgia arenacearia (Den. & Schiff.) i Nola chlamitulalis (Hübn.) dosad su zabilježene za Hrvatsku tek nekoliko puta