Richard Arthur Northwood "Dick" Bonnycastle (born September 26, 1934) is a Canadian businessman who is the former owner and publisher of Harlequin Enterprises (founded in 1949 by his father Richard H. G. Bonnycastle), the world's largest publisher of romantic fiction, as well as an owner of Thoroughbred racehorses Harlequin Ranches. He is part of the Bonnycastle family founded in Canada by British military officer, Sir Richard Henry Bonnycastle.