Naturism is a lifestyle of practicing non-sexual social nudity in private and in public; the word also refers to the cultural movement which advocates and defends that lifestyle. Both may alternatively be called nudism. Though the two terms are broadly interchangeable, nudism emphasizes the practice of nudity, whilst naturism highlights an attitude favoring harmony with nature and respect for the environment, into which that practice is integrated. That said, naturists come from a range of philosophical and cultural backgrounds; there is no single naturist ideology.

Christian naturism is the practise of naturism or nudism by Christians.