Phnom Santuk () is a hill and cultural site in the Cambodian province of Kampong Thom. Located in Ko Koh village, Ko Koh commune, Santuk District, it is the most sacred mountain of the province. The summit is accessed by a stone pathway with many statues flanking the way. At the top is a white-walled temple and many shrines and deities, including several reclining Buddhas made out of rock, measuring more than in length. Monks inhabit the site.