Kanuma, city, central Tochigi ken (prefecture), east-central Honshu, Japan. It lies at the eastern foot of the Ashio Highlands and borders Utsunomiya to the east.
The central part of the city was a post town during the Edo (Tokugawa) period (1603–1867); it later developed as a market for hemp seed. Kanuma is now a minor industrial centre, producing lumber, furniture, rope, and brooms. The city is called the source of a certain gardening soil called Kanuma-tsuchi. The mountainous western part of the city is a prefectural natural park. From Kanuma, an avenue of Japanese cedars runs northwest to the ancient city of Nikkō. Pop. (2010) 102,348; (2015) 98,374.