Donousa (Greek: Δονούσα, also Δενούσα Denousa), and sometimes spelled Donoussa, is an island and a former community in the Cyclades, Greece. Since the 2011 local government reform it is part of the municipality Naxos and Lesser Cyclades, of which it is a municipal unit. Donousa is the easternmost island of the Lesser Cyclades.
