Oppyn teoksia ovat muun muassa Ontological Arguments and Belief in God (1995), Philosophical Perspectives on Infinity (2006), Arguing About Gods (2006), naturalismia puolustava The Best Argument Against God (2013) sekä Reinventing Philosophy of Religion (2014).
Naturalism and Religion. A Contemporary Philosophical Investigation. (Investigating Philosophy of Religion)New York:Routledge, 2018.ISBN978-0-815-35466-6
Koterski, Joseph W. & Oppy, Graham (toim.):Theism and Atheism. Opposing Arguments in Philosophy.Farmington Hills, Michigan:Macmillan Reference USA, 2018.ISBN978-0-02-866445-3
(toim.):A Companion to Atheism and Philosophy. (Blackwell Companions to Philosophy)Oxford:Wiley-Blackwell, 2019.ISBN978-1-119-11911-1
Oppy, Graham & Pearce, Kenneth L.:Is There a God? A Debate. (Little Debates about Big Questions)London:Routledge, 2021.ISBN978-0-367-24394-4