God Is Not Great is a 2007 book by author and journalist Christopher Hitchens in which he makes a case against organized religion. It was originally published in the United Kingdom by Atlantic Books as God Is Not Great: The Case Against Religion and in the United States by Twelve as God Is Not Great: How Religion Poisons Everything, but was republished by Atlantic Books in 2017 with no subtitle.

Christopher Eric Hitchens was a British and American author, journalist, and educator. Author of 18 books on faith, culture, politics and literature, he was born and educated in Britain, graduating in the 1970s from Oxford with a degree in Philosophy, Politics and Economics. In the early 1980s, he emigrated to the United States and wrote for The Nation and Vanity Fair. Known as "one of the 'four horsemen'" of New Atheism, he gained prominence as a columnist and speaker. His epistemological razor, which states that "what can be asserted without evidence can also be dismissed without evidence", is still of mark in philosophy and law.