Frosta is the smallest municipality in Trøndelag county, Norway. The administrative centre is the village of Frosta. The municipality is located along the Trondheimsfjord, on the Frosta peninsula, just north of the city of Trondheim. It also includes the island of Tautra which is connected to the mainland by a causeway bridge.

Trøndelag (Urban East Norwegian: [ˈtrœ̂ndəˌlɑːɡ]; or Trööndelage  is a county and coextensive with the Trøndelag region in the central part of Norway. It was created in 1687, then named Trondhjem County ; in 1804 the county was split into Nord-Trøndelag and Sør-Trøndelag by the King of Denmark-Norway, and the counties were reunited in 2018 after a vote of the two counties in 2016.