Kosor may refer to:
- Kosor (surname), a surname
- Kosoř, a village and municipality in the Czech Republic
Kosor is a surname. Notable persons with that surname include:
- Darinko Kosor (born 1965), Croatian politician
- Jadranka Kosor (born 1953), Croatian politician and prime minister
- Josip Kosor (1879–1961), Croatian novelist and playwright.