(1968 - 16 March 1981) (divorced) (2 children)
He met his future wife model and actress Barbara Bach in New York while she worked as a model and he was visiting from Italy for a business trip in 1966. Barbara followed him to Italy to be with him. In 1968, when she was 18, they married. Bach moved with him to Rome where she soon adapted to a new way of living:
"He was 10 years older than me and he was from a wonderful family...Living in another country for 10 years, speaking their language, I almost had a completely different identity."
They had 2 children, Francesca (b. 7th August 1968) and Gian Andrea (b. 1972), who suffered from Cerebral Palsy. His wealthy father paid for a corrective operation in America, at the time the best treatment money could buy.
In 1975, Barbara and Augusto Gregorini separated when she moved to Los Angeles, California. The couple divorced in 1978, sharing custody of their 2 children.