Distributional data are presented for 208 species occurring in Argentina, 2 species for which records apparently are based on misidentifications, and 1 species that no longer is found there. Data are organized by province or, in the case of Tierra del Fuego, by national territory. The relationship of the mosquito fauna of Misiones Province to that of Brazil is documented, and attention is drawn to the depauperate mosquito fauna of the Patagonian region of Argentina. Literature citations or collection records, or both, are given to document the occurrence of each species in a particular province or territory. A comprehensive bibliography is provided.