Koit (Estonian for dawn) or KOIT may refer to:
- KOIT, a radio station (96.5 FM) licensed to San Francisco, California, US
- Koit (name), an Estonian masculine given name
- "Koit" (song), by Tõnis Mägi
- Koit (star) or XO-4, a star in the Lynx constellation
- Koit, a character, for which the star is named, from a folk tale by Friedrich Robert Faehlmann
- Koit (newspaper), former newspaper of Põlva County