Alister McGrath (born 23 January 1953) is a Northern Irish biologist and Christian apologist. He is a Professor of Historical Theology at Oxford University. He was a previous head of Wycliffe Hall, one of Oxford's religious Permanent Private Halls.
McGrath, a former atheist, is one of the world's leading critics of Richard Dawkins. He published a critique of Dawkins' book The God Delusion titled The Dawkins Delusion?. Another book of McGrath's is called The Twilight of Atheism, which chronicles the fluctuation of atheism throughout history. He has also publicly debated Dawkins as well as other well-known atheist intellectuals, including Stephen Law, Daniel Dennett, and Christopher Hitchens.
In 2013, McGrath's biography on the Christian intellectual C.S. Lewis was published.