Neossos is a genus of flies in the family Heleomyzidae.

Species Neossos atlanticus Gilbert & Wheeler, 2007 Neossos broersei (de Meijere, 1946) Neossos californicus Melander, 1952 Neossos marylandicus Malloch, 1927 Neossos nidicola (Frey, 1930) Neossos tombstonensis Solecki & Wheeler, 2015

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