Tosa (土佐市 Tosa-shi) is a city in Kōchi Prefecture, Japan. It is located on the southern coast of the island of Shikoku.
As of December 1, 2011, the city has an estimated population of 28,897, with 12,080 households, and a population density of 315.50 persons per km². The total area is 91.59 km².
The city of Tosa should not be confused with the historical Tosa Province, which covered all of modern-day Kōchi Prefecture.
The city was founded on January 1, 1959.
Tosa is located in central Kōchi Prefecture, and faces the Shikoku Mountain Range to the north and Pacific Ocean to the south. The Niyodo River flows through the Takaoka Plain in the town, where rice is grown.
Surrounding municipalities 
Sister cities 
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