Oyama (小山町, Oyama-chō) is a town located in Suntō District, Shizuoka Prefecture, Japan.

Located in between the Tanzawa Mountains and the foothills of Mount Fuji, the town has an average altitude of 800 meters, and has a cool climate with heavy rainfall.

With the establishment of the modern municipalities system in the early Meiji period on April 1, 1889, the area was reorganized into the villages of Rokugo, Kannuma, Ashigara, Kitago and Subashiri within Suntō District, Shizuoka, two months after the opening of Suruga-Oyama Station on the Tōkaidō Main Line (now Gotemba Line).

Oyama annexed neighboring Ashigara on April 1, 1955, Kitago Village on August 1, 1956 and Subashiri on September 30, 1956.

Due to its proximity to the Tokyo metropolitan area, Oyama has a mixed economy of agriculture and light industry.