Sinop can refer to:
- Sinop, Turkey, a city on the Black Sea
- Sinop Nuclear Power Plant, was planned in 2013, but cancelled in 2018
- Battle of Sinop, 1853 naval battle in the Sinop port
- Russian ship Sinop, Russian ships named after the battle
- Sinop Province, the province in Turkey of which the above city is the capital
- Sinop (electoral district), the province's electoral district
- Sinop, Mato Grosso, a city in Mato Grosso state, Brazil
- Sinop (grasshopper), a genus of grasshoppers in the family Acrididae
- Sinop (crater), a small crater on Mars