"Chaucerian Realism" is concerned with the understanding of Chaucer and of his age of the intentionality, or object-directedness, of thought and language. It considers how intentionality was considered and understood in the Middle Ages, the sources of this understanding, how intentionality is considered today, and how Chaucer's modern understanding of the intentionality of language makes his fiction psychologically realistic - a view of Chaucer's writing previously thought to be untenable. Where modern criticsm has tended to see Chaucer as a nominalist, that is, anti-realist, this book sets out to demonstrate that he is a realist in many senses of the term, a foundational realist, an epistemological realist, a semiotic and linguistic realist, an ethical realist, as well as a writer of realistic fiction. Through the introduction of the term "intentionalist realism", the author offers a means of considering these realisms. The book refers to many of Chaucer's texts while making its conclusive demonstration with an examination of the thorough and deliberate play with three-level semantics in the "Friar's Tale", the very subject of which is intentionality.