- Great Slave LakeA lake in the Northwest Territories, Canada; one of the largest lakes in the world and the deepest lake in North America.
- Lesser Slave LakeA lake in Alberta, Canada; one of the largest lakes in Alberta.
- SclaviaA former continent on Earth. A proposed ancient continent that would later merge together with the continents of Vaalbara and Superia to form the supercontinent Kenorland. It is observable as a former supercraton composed of the cratons of Slave, Wyoming, Dharwar, Zimbabwe
- Slave LakeFormer name of Great Slave Lake: a lake in the Northwest Territories, Canada.
- slaveyA male servant.