Theravada Buddhism is the official religion of Cambodia, practised by more than 95 percent of the population with an estimated 4,392 monastery temples throughout the country. Cambodian Buddhism is deeply influenced by Hinduism and native animism.

The close interrelationship between spirits and the community, the efficacy of apotropaic and luck-attracting actions and charms, and the possibility of manipulating one's life through contact with spiritual entities such as the "baromey" spirits originates from the native folk religion. Hinduism has left little trace beyond the magical practices of Tantricism and a host of Hindu gods now assimilated into the spirit world (for example, the important neak ta spirit called Yeay Mao is the modern avatar of the Hindu goddess Kali).

Mahayana Buddhism is the religion of the majority of Chinese and Vietnamese in Cambodia. Elements of other religious practices, such as the veneration of folk heroes and ancestors, Confucianism, and Taoism mix with Chinese Buddhism are also practised.

Islam is followed by about 2% of the population and comes in three varieties, two practised by the Cham people and a third by the descendants of Malays, resident in the country for generations. Cambodia's Muslim population is reported to be 80% ethnic Cham.