Tadotsu (多度津町, Tadotsu-chō) is a town located in Nakatado District, Kagawa Prefecture, Japan.

It borders the Sanuki Plain to the south and the scenic Setonaikai National Park to the north.

Following the Meiji restoration, the town of Tadotsu was established with the creation of the modern municipalities system on February 15, 1890.

Tadotsu has a mayor-council form of government with a directly elected mayor and a unicameral town council of 14 members.

In terms of national politics, the town is part of Kagawa 3rd district of the lower house of the Diet of Japan.