Byneset is a former municipality in the old Sør-Trøndelag county in 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 Municipality 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.
Prior to its dissolution in 1964, the 78.5-square-kilometre (30.3 sq mi) municipality was the 548th largest by area out of the 689 municipalities in Norway. Byneset Municipality was the 437th most populous municipality in Norway with a population of about 2,008. The municipality's population density was 25.6 inhabitants per square kilometre (66/sq mi) and its population had increased by 4.7% over the previous 10-year period.