Giles Blunt (born 1952) is a Canadian novelist, poet, and screenwriter. His first novel, Cold Eye, was a psychological thriller set in the New York art world, which was made into the French movie Les Couleurs du diable (Allain Jessua, 1997).

He is also the author of the John Cardinal novels, set in the small town of Algonquin Bay, in Northern Ontario. Blunt was born in Windsor, Ontario, and grew up in North Bay; Algonquin Bay is North Bay thinly disguised — for example, Blunt retains the names of major streets and the two lakes (Trout Lake and Lake Nipissing) that the town sits between, the physical layout of the two places is the same, and he describes Algonquin Bay as being in the same geographical location as North Bay.

The first Cardinal story, Forty Words for Sorrow, won the British Crime Writers' Association Silver Dagger, and the second, The Delicate Storm, won the Crime Writers of Canada's Arthur Ellis Award for best novel, as did the sixth, "Until the Night." The 2010 John Cardinal novel Crime Machine was described as "a richly plotted work by one of Canada's best mystery novelists."

He also has written No Such Creature, a "road novel" set in the American southwest, and Breaking Lorca, which is set in a clandestine jail in El Salvador in the 1980s. Twice nominated for the Dublin IMPAC award, his novels have been compared to the work of Ian Rankin and Cormac McCarthy.

His television credits include episodes of Law & Order, Street Legal, and Night Heat plus four series of Cardinal.

Giles Blunt received the honorary degree of Doctor of Education on June 12, 2014, from Nipissing University.