Constant is a human name, and may refer to:
- Benjamin Constant (1767-1830), Swiss-born thinker, writer and French politician
- Benjamin Constant (Brazil) (1836-1891), Brazilian military man and political thinker
- David Constant (born 1941), international cricket umpire
- Edward Constant II (born circa 1942), American historian
- Emmanuel Constant (born 1956), founder of FRAPH
- Marius Constant (1925-2004), Romanian-born French composer
- Paul-Henri-Benjamin d'Estournelles de Constant (1852-1924), French diplomat and politician
- Pete Constant (21st century), American politician
