Trøndelag County Municipality (Norwegian: Trøndelag fylkeskommune or Southern Sami: Trööndelagen fylhkentjïelte) is the democratically elected regional governing administration of Trøndelag county in Norway. The main responsibilities of the county municipality includes the running of 36 upper secondary schools, with 17,000 pupils. It administers thousands of kilometers of county roadways, public transport, dental care, culture, and cultural heritage.

The Trøndelag county council (Norwegian: Fylkestinget) is made up of 59 representatives that are elected every four years. The council essentially acts as a Parliament or legislative body for the county and it meets about six times each year. The council is divided into standing committees and an executive board (fylkesutvalg) which meet considerably more often. Both the council and executive board are led by the County Mayor (fylkesordfører).

Public transport in the county are operated on public service obligation contracts from the county municipality via the transportation authority company AtB AS (meaning A to B), and operations are performed by Boreal Buss, Nettbuss, Tide Buss and TrønderBilene (buses), Boreal Bane (tram), and Fosen Trafikklag and Kystekspressen (passenger ferries). County road are operated by the Norwegian Public Roads Administration, though managed by the county municipality.

The county operates 32 upper secondary schools in the county.^[2]