Ottersbo or Ottarsbu is a village in Ørland Municipality in Trøndelag county, Norway. It is located along the Stjørnfjorden, about 1 kilometre (0.62mi) east of the Austrått manor.

The Ottarsbu residential area was built up during the years 1977–1980. It is a peaceful quiet area with approximately 100 houses only about 8 kilometres (5.0mi) east of the municipal center of Brekstad. The 0.29-square-kilometre (72-acre) village has a population (2024) of 404 and a population density of 1,393 inhabitants per square kilometre (3,610/sqmi).