Bretz is a surname. Notable people with the surname include:
- Eleonora Bretz, Luxembourgian-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
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