Riess or Rieß is a German surname. Notable people with the surname include:
Adam Riess (contemporary), American astrophysicist
Erwin Riess (born 1957), Austrian playwright
Fritz Riess (1922–1991), German Formula One race car driver
Peter Riess (1804-1883), German Jewish physicist
L. W. 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
