Bastøy Lighthouse (Norwegian: Bastøy fyr) is a coastal lighthouse in Horten Municipality in Vestfold county, Norway.

It is located on the island of Bastøy in the Oslofjorden, about 4 kilometres (2.5 mi) southeast of the town of Horten.

It was established in 1840 and originally consisted of a stone house with a low tower.

It was replaced by an automated light in 1986.

This Norwegian lighthouse-related article is a stub.