Linesøya is an island in the municipality of Åfjord in Sør-Trøndelag county, Norway. It lies about 3 kilometres (1.9 mi) off the coast of the mainland of Åfjord, and 1 kilometre (0.62 mi) southwest of the island of Stokkøya. The 16.6-square-kilometre (6.4 sq mi) island also lies about 6.5 kilometres (4.0 mi) north of the smaller island of Lauvøya.