Hiyama (檜山郡; -gun) is a district located in Hiyama Subprefecture, Hokkaido, Japan.

As of 2004, the district has an estimated population of 21,896 and a density of 19.59 persons per km². The total area is 1,117.57 km².

Towns and villages

• Assabu
• Esashi
• Kaminokuni