Spiritual naturalism, or naturalistic spirituality combines a naturalist philosophy with spirituality. Spiritual naturalism may have first been proposed by Joris-Karl Huysmans in 1895 in his book En Route.Coming into prominence as a writer during the 1870s, Huysmans quickly established himself among a rising group of writers, the so-called Naturalist school, of whom Émile Zola was the acknowledged head...With Là-bas (1891), a novel which reflected the aesthetics of the spiritualist revival and the contemporary interest in the occult, Huysmans formulated for the first time an aesthetic theory which sought to synthesize the mundane and the transcendent: "spiritual Naturalism".

Religious naturalism is a framework for religious orientation in which a naturalist worldview is used to respond to types of questions and aspirations that are parts of many religions. It has been described as "a perspective that finds religious meaning in the natural world."