John Desmond Singleton (born 9 November 1941) 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.
In 2019, Singleton signed a $80m deal to sell his stake in Macquarie Media.
Singleton had a 32.2% stake in Macquarie Media which Nine Entertainment bought from him for $1.46 per share.