The Existence of God is a 1979 book by British philosopher of religion Richard Swinburne, claiming the existence of the Abrahamic God on rational grounds. The argument rests on an updated version of natural theology with biological evolution using scientific inference, mathematical probability theory, such as Bayes' theorem, and of inductive logic. In 2004, a second edition was released under the same title.

Richard Granville Swinburne is an English philosopher. He is an Emeritus Professor of Philosophy at the University of Oxford. Over the last 50 years, Swinburne has been a proponent of philosophical arguments for the existence of God. His philosophical contributions are primarily in the philosophy of religion and philosophy of science. He aroused much discussion with his early work in the philosophy of religion, a trilogy of books consisting of The Coherence of Theism, The Existence of God, and Faith and Reason.