John Desmond Singleton is an Australian entrepreneur. He built his success and wealth in the advertising business in Australia in the 1970s and 1980s.

He now has diverse investment interests in radio broadcasting, publishing and thoroughbred breeding and racing.

John Singleton Advertising listed publicly, became the Singleton Group Ltd in 1996, then grew to become the STW Communications Group Ltd in 2002 which now owns over 50 Australian marketing and advertising businesses