Linesøya[1] is an island in Åfjord Municipality in 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.

[2] 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.

The highest point on Linesøya is the 230-metre (750 ft) tall mountain Linesfjellet.

[3] After the completion in 2011 of the Linesøy Bridge between Linesøya and Stokkøya and the Stokkøy Bridge from Stokkøya to the mainland, there has been a ferry-free road to the mainland from Linesøya.