Katsunuma (勝沼町 Katsunuma-chō) was a town located in Higashiyamanashi District, Yamanashi, Japan.
On November 1, 2005 Katsunuma was merged with the village of Yamato, also from Higashiyamanashi District, and the city of Enzan to form the new city of Kōshū.
As of 2003, the town had an estimated population of 9,271 and a density of 255.82 persons per km². The total area was 36.24 km².