Tosa (土佐郡; -gun) is a district located in Kochi, Japan.

As of 2003, the district has an estimated population of 8,930 and a density of 14.05 persons per km². The total area is 635.37 km².

Towns and villages

• Hongawa
• Kagami
• Okawa
• Tosa
• Tosayama

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