Tomiyama (富山町, Tomiyama-chō) was a town located in Awa District, Chiba Prefecture, Japan.

Tomiyama was located at the southwest end of Chiba Prefecture, in an inland area of the southern Bōsō Peninsula, with a small shoreline facing the entrance to Tokyo Bay on the Pacific Ocean.

The area around Tomiyama was the setting of the Nansō Satomi Hakkenden, an epic novel by Edo period author Kyokutei Bakin.

On March 20, 2006, Tomiyama, along with the towns of Chikura, Maruyama, Shirahama, Tomiura and Wada, and the village of Miyoshi (all from Awa District), was merged to create the city of Minamibōsō.

The economy of Tomiyama was largely based on horticulture (primarily herbs and flowers), and summer tourism.