Kokubunji (国分寺町, Kokubunji-machi) was a town located in Shimotsuga District, Tochigi Prefecture, Japan.
As of 2003, the town had an estimated population of 17,373 and a density of 835.24 persons per km2. The total area was 20.80 km2.
On January 10, 2006, Kokubunji, along with the town of Minamikawachi (from Kawachi District), and the town of Ishibashi (also from Shimotsuga District), was merged to create the new city of Shimotsuke.