Mentz may refer to:
- Mentz, New York, in the United States
- Mentz, Texas
Mentz is also a surname:
- August Mentz (1867-1944), Danish botanist
- Hendrik Mentz (1877-1938), South African politician
- Henno Mentz (b. 1979), South African rugby player
- Henry Mentz (1920-2005), Federal District Judge, American jurist and scholar
- Johann von Mentz (?-1583), Governor of Ösel (1576-1584)
- MJ Mentz (b. 19?), South African rugby player (brother of Henno)