Inasa District (引佐郡 Inasa-gun) was a rural district located in western Shizuoka, Japan. Over the course of several mergers and consolidations, all of the district has been absorbed into the city of Hamamatsu, and was abolished in 2005.
As of the end of 2003 (the last data available before its dissolution), the district had an estimated population of 52,485 and a population density of 227.20 persons per km². Its total area was 231.01 km².
Inasa District was created in the early Meiji cadastral reforms of April 1, 1889, and consisted at the time of two towns (Kito and Kanasashi) and six villages. On April 1, 1896 Aratama District (麁玉郡 Aratama-gun) and Nishi-Hamana Village from Fuchi District (敷知郡 Fuchi-gun) were joined to Inasa District. Nishi-Hamana became a town on May 1, 1922 and was renamed Mikkabi, giving the district three towns and eight villages.
Iitani Village was annexed by Kanasashi, and the town renamed Inasa on April 1, 1953. On April 1, 1955, Kito annexed Nakamura Village and was renamed Hosoe. The remaining villages were consolidated in 1955-1956, with Miyakoda Village going to the city of Hamamatsu, Higahi-Hamada joining Mikkabi Town, Okuyama and Ihei Villages joining with Inasa Town and Aratama Village joining the town of Hamakita in Hamana Distict.
On July 1, 2005 the towns of Hosoe, Inasa and Mikkabi were mergedinto the city of Hamamatsu. As a result, Inasa District ceased to exist as an administrative unit.
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