Chaucer’s God considers how characters invoke God, both in terms of the everyday language of late medieval England and in the ways that the idea of God is reflected in Chaucer’s fiction. Conventional, non-theological utterances of the names for God by Chaucer’s characters as part of their, by turns, outwardly pious and unthinkingly impious phraseologies are discussed in the opening section, God Woot – ‘God knows’. Under the heading God Forwoot – ‘God foreknows’, some of the more challenging invocations of God are considered, such as the implications of divine foreknowledge and predestination on human free will in the Knight’s Tale, the Nun’s Priest’s Tale and Troilus and Criseyde. The concluding section, God in a Cruel World, asks whether in the Clerk’s Tale and the Franklin’s Tale, if Chaucer allowed his tales to reflect, and characters to reflect upon, the heretical notion of a God lacking in compassion for humanity.