Deism is a philosophical belief that posits that God exists and is ultimately responsible for the creation of the universe, but does not interfere directly with the created world. Equivalently, Deism can also be defined as the view which posits God's existence as the cause of all things, and admits its perfection (and usually the existence of natural law and Providence) but rejects divine revelation or direct intervention of God in the universe by miracles. It also rejects revelation as a source of religious knowledge and asserts that reason and observation of the natural world are sufficient to determine the existence of a single creator or absolute principle of the universe.

Deism gained prominence among intellectuals during the Age of Enlightenment, especially in the United Kingdom, France, Germany, and the United States. Typically, these had been raised as Christians and believed in one God, but they had become disenchanted with organized religion and orthodox teachings such as the Trinity, Biblical inerrancy, and the supernatural interpretation of events, such as miracles. Included in those influenced by its ideas were leaders of the American and French Revolutions.

Today, deism is considered to exist in the classical and modern forms, where the classical view takes what is called a "cold" approach by asserting the non-intervention of deity in the natural behavior of the created universe, while the modern deist formulation can be either "warm" (citing an involved deity) or "cold" (citing an uninvolved deity). These lead to many subdivisions of modern deism, which serves as an overall category of belief.

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