Gentoo may refer to:
- Gentoo Penguin, a species of bird
- Gentoo Linux, a computer operating system distribution
- Gentoo/FreeBSD, a port of Gentoo Linux to the FreeBSD kernel and userland
- Gentoo (file manager), a free file manager for Linux and other Unix-like systems
- Gentoo, an alternative, archaic name of Telugu
- Gentoo, a historical, archaic term for Hindus