Maass or Maaß is a German surname. People with this surname include:
Clara Maass (1876–1901), American nurse David Maaß (born 1984), German politician G. F. H. Maass (1830–1901), German botanist Gustav Maass (1893–1964), American architect Hans Maass (1911–1992), German mathematician Hermann Maaß (1897–1944), resistance fighter Johann Maass (1766–1823), German psychologist Leberecht Maass (1863–1914), German admiral Peter Maass (born 1960), American journalist Otto Maass (1890–1961), Canadian chemist Verena Butalikakis (née Maass; 1955–2018), German politician
See also Mas (disambiguation) Maas (disambiguation) Maß Maes (disambiguation) Maus