Pantheism is the philosophical religious belief that reality, the universe and the cosmos are identical to divinity and a supreme being or entity. The physical universe is thus understood as an immanent creator deity, still expanding and creating, which has existed since the beginning of time. The term 'pantheist' designates one who holds both that everything constitutes a unity and that this unity is divine, consisting of an all-encompassing, manifested god or goddess. All astronomical objects are thence viewed as parts of a sole deity.

The worship of all gods of every religion is another definition, but it is more precisely termed Omnism. Pantheist belief does not recognize a distinct personal god, anthropomorphic or otherwise, but instead characterizes a broad range of doctrines differing in forms of relationships between reality and divinity. Pantheistic concepts date back thousands of years, and pantheistic elements have been identified in various religious traditions. The term pantheism was coined by mathematician Joseph Raphson in 1697 and since then, it has been used to describe the beliefs of a variety of people and organizations.

Pantheism was popularized in Western culture as a theology and philosophy based on the work of the 17th-century philosopher Baruch Spinoza, in particular, his book Ethics. A pantheistic stance was also taken in the 16th century by philosopher and cosmologist Giordano Bruno.