Yamaga (山鹿市 Yamaga-shi) is a city in Kumamoto Prefecture, Japan. The city was founded on April 1, 1954.
On January 15, 2005, Yamaga absorbed the towns of Kahoku, Kamoto, Kaō and Kikuka (all from Kamoto District) to create the new and expanded city of Yamaga.
As of this merger but with 2003 population estimates, the city has an estimated population of 58,678 and a population density of 196 persons per km². The total area is 299.67 km².
Attractions include the Kumamoto Prefectural Ancient Burial Mound Museum.
Notable people from Yamaga