William John Banville (born 8 December 1945) is an Irish novelist, short story writer, adapter of dramas and screenwriter. Though he has been described as "the heir to Proust, via Nabokov", Banville himself maintains that W. B. Yeats and Henry James are the two real influences on his work.

Banville has won the 1976 James Tait Black Memorial Prize, the 2003 International Nonino Prize, the 2005 Booker Prize, the 2011 Franz Kafka Prize, the 2013 Austrian State Prize for European Literature and the 2014 Prince of Asturias Award for Literature. He was elected a Fellow of the Royal Society of Literature in 2007. Italy made him a Cavaliere of the Ordine della Stella d'Italia (essentially a knighthood) in 2017. He is a former member of Aosdána, having voluntarily relinquished the financial stipend in 2001 to another, more impoverished, writer.