Riess or Rieß is a German surname. Notable people with the surname include:
Adam Riess (contemporary), American astrophysicist Erwin Riess (1957–2023), Austrian playwright Fritz Riess (1922–1991), German Formula One race car driver Jana Riess (born 1969), American writer Peter Riess (1804–1883), German Jewish physicist Lew Riess (1887–1946), American college sports coach Ludwig Riess (1861–1928), German-American historian and educator Ryan Riess (born 1990), American professional poker player and 2013 World Series of Poker Main Event champion Stefan Rieß (born 1988), German professional football player Susanne Riess-Passer (born 1961), Austrian politician
See also Ries (disambiguation) Ríos (disambiguation)
Riess Family