Flå is a former municipality in the old Sør-Trøndelag county, Norway. The approximately 110-square-kilometre (42 sq mi) municipality existed from 1880 until its dissolution in 1964. Flå was located in the eastern part of what is now the municipality of Melhus in Trøndelag county. The administrative centre was the village of Ler. The main church for the area is Flå Church.