Katsuyama is a city located in Fukui Prefecture, Japan. As of 31 May 2018, the city has an estimated population of 23,527, with 7,973 households, and a population density of 93 persons per km2. The total area of the city was 253.88 square kilometres (98.02 sq mi). Katsuyama was the ninth-best ranking city in a ranking that compared health and sanitation in cities around the world published in April 2007.

Fukui Prefecture is a prefecture of Japan located in the Chūbu region of Honshū. Fukui Prefecture has a population of 778,943 and has a geographic area of 4,190 km2. Fukui Prefecture borders Ishikawa Prefecture to the north, Gifu Prefecture to the east, Shiga Prefecture to the south, and Kyoto Prefecture to the southwest.