Airbertach mac Cosse, died 1016, was an Irish poet, lector and later superior of the monastery of Ros Ailithir (now Rosscarbery), on the coast of south-west County Cork. Rofessa i curp Domuin Dúir, a poem on the geography of the world, is ascribed to him in both the Rawlinson B 502 and the Book of Leinster.