Byneset is a former municipality in Sør-Trøndelag county, Norway. The 78.5-square-kilometre (30.3 sq mi) municipality existed from 1838 until its dissolution in 1964. The municipality of Byneset encompassed the western part of what is now Trondheim municipality in Trøndelag county. Byneset was located along an arm of the Trondheimsfjord and it was separated from the city of Trondheim by the Bymarka recreation area. The local Byneset Church is one of the oldest stone churches in Norway. The largest village in Byneset was Spongdal which was the administrative centre of the municipality. Other villages included Byneset and Langørjan.^[3]

The municipality of Byneset was established on 1 January 1838 (see formannskapsdistrikt). According to the 1835 census, there were 2,143 people living in Byneset.^[4] In 1855, the southern parish of Buvik (population: 841) was separated from Byneset to form its own municipality. This left Byneset with a population of 2,109.^[5]

During the 1960s, there were many municipal mergers across Norway due to the work of the Schei Committee. On 1 January 1964, the neighboring municipalities of Byneset (population: 2,049), Leinstrand (population: 4,193), Strinda (population: 44,600), Tiller (population: 3,595), and the city of Trondheim (population: 56,982) were merged to form the new urban municipality of Trondheim which would have a total population of 111,419.^[5]

While it existed, this municipality was responsible for primary education (through 10th grade), outpatient health services, senior citizen services, unemployment, social services, zoning, economic development, and municipal roads. During its existence, this municipality was governed by a municipal council of elected representatives, which in turn elected a mayor.^[7]