Retzius is a surname. Notable people with the surname include:
Anders Jahan Retzius (1742–1821), Swedish naturalist Anders Retzius (1796–1860), Swedish anatomist; son of Anders Jahan Retzius Gustaf Retzius (1842–1919), Swedish anatomist, liberal publicist; son of Anders Retzius
See also Retropubic space, also known as "Retzius' space" Striae of Retzius, named after Anders Retzius Retzia, genus of plant in the family Stilbaceae; named after Anders Jahan Retius