Emanationism is an idea in the cosmology or cosmogony of certain religious or philosophical systems. Emanation, from the Latin emanare meaning "to flow from" or "to pour forth or out of", is the mode by which all things are derived from the First Reality, or Principle. All things are derived from the first reality or perfect God by steps of degradation to lesser degrees of the first reality or God, and at every step the emanating beings are less pure, less perfect, less divine. Emanationism is a transcendent principle from which everything is derived, and is opposed to both Creationism (wherein the universe is created by a sentient God who is separate from creation) and materialism (which posits no underlying subjective and/or ontological nature behind phenomena, being immanent).

Emanationism is a cosmological theory which asserts that all things "flow" from an underlying principle or reality, usually called the Absolute or Godhead. Any teachings which involve emanation are usually in opposition to creation ex nihilo as emanation advocates that everything has always existed and has not been "created" from nothing.