Geoffrey Piers Henry Dutton AO (2 August 1922 – 17 September 1998) was an Australian author and historian.
Dutton was born into a prominent pastoralist family of Anlaby Station near Kapunda, South Australia in 1922. His grandfather was Henry Dutton, the "Squire of Anlaby"; his parents were adventurer Henry Hampden Dutton and talented socialite Emily Dutton. For his relationship to these and other people prominent in the history of South Australia see separate article.
He studied at the University of Adelaide, where he wrote for the student newspaper On Dit and avant-garde magazine Angry Penguins. He later studied at Magdalen College, Oxford. During his career, Dutton wrote or edited over 200 books, including poetry, fiction, biographies, art appreciation, art and literary history, travel books, novels for children and critical essays.
He was appointed an Officer of the Order of Australia in 1976, and died in 1998.