John Banville (born 1945) is an Irish novelist and journalist. His novel, The Book of Evidence (1989), was shortlisted for the Booker Prize, and won the Guinness Peat Aviation award. His eighteenth novel, The Sea, won the Man Booker Prize in 2005. He sometimes writes under the pseudonym Benjamin Black.

Banville is known for his precise and cold prose style, Nabokovian inventiveness, and for the dark humour of his generally arch narrators. His stated ambition is to give his prose "the kind of denseness and thickness that poetry has".

A brilliant, engaging and highly literate espionage-cum-existential novel, John Banville's The Untouchable concerns the suddenly-exposed double agent Victor Maskell, a character based on the real Cambridge intellectual elites who famously spied on the United Kingdom in the middle of the 20th century. But Maskell--scholar, adventurer, soldier, art curator and more--respected and still living in England well past his retirement from espionage, looked like he was going to get away with it when unexpectedly, in his 70s and sick with cancer, he is unmasked. The question of why, and by whom assumes less importance for Maskell than the soul-searching questions of who, ultimately, he really is, why he spied in the first place, and whether his many-faceted existence adds up to an authentic life.