Bretz is a surname. Notable people with the surname include:
Eleonora Bretz, Luxembourgish-Greek female model George Bretz (1880–1956), Canadian lacrosse player George Bretz (photographer), American photographer Greg Bretz (born 1990), American snowboarder Harley 'J Harlen" Bretz (1882–1981), American geologist, first to recognize evidence of the Missoula Floods, also known as the Bretz Floods Jim Bretz (born 1964), American baseball coach and scout John L. Bretz (1852–1920), U.S. Representative from Indiana Steeven Bretz (born 1976), German politician