Hatsukaichi (廿日市市, Hatsukaichi-shi^?) is a city of some 120,000 people located in Hiroshima Prefecture, Japan. The name derives from a market traditionally held on the 20th of each month with hatsuka (廿日) meaning "20th day" and ichi (市) translating to "market". The market continues to this day on a small scale featuring fresh, locally grown vegetables and foodstuffs.

Following the absorption of the nearby towns of Ōno and Miyajima on November 3, 2005, as of February 2010, Hatsukaichi has a density of 235 persons per km². The total land area stands at 489.36 km².