Pieza is a genus of flies in the family Mythicomyiidae. Its species are found in North America, South America, and the West Indies. The genus was named by Neal Evenhuis in 2002. Evenhuis included the following eleven species, transferring four from Mythicomyia, in his initial circumscription:P. agnastis (Hall, 1976) — Chile P. angusta (Melander, 1961) — United States and Mexico P. deresistans Evenhuis, 2002 — northern Venezuela †P. dominicana Evenhuis, 2002 — Dominican amber, Miocene P. flavitibia Evenhuis, 2002 — northern Venezuela P. kake Evenhuis, 2002 — Brazil P. minuta (Greene, 1924) — United States and Mexico P. ostenta (Melander, 1961) — United States and Mexico P. pi Evenhuis, 2002 — Bahamas, Turks and Caicos, Mexico (Morelos) P. rhea Evenhuis, 2002 — United States (Florida) P. sinclairi Evenhuis, 2002 — Curaçao, Dominican Republic; introduced to Galápagos Islands
