Tåtøy or Tåtei is an island in Kragerø Municipality in Telemark county, Norway.

The 1-square-kilometre (250-acre) island is located in the Kilsfjord, just to the south of the mainland town of Kragerø.

The small island of Kragerø lies about 1 kilometre (0.62 mi) to the northeast and the large island of Skåtøy lies about 2.5 kilometres (1.6 mi) to the east.

Kragerø Fjordbåtselskap runs a scheduled ferry service between Tåtøy and Stabbestad (on the mainland to the south), to the island of Skåtøy, and to the mainland town of Kragerø to the north.

[2] In 1967 it was written in the newspaper that Tåtøy had Norway's oldest apple tree.