John Austen Anstruther-Gough-Calthorpe (born 14 July 1947) is a property developer and former chairman of the Watermark Group.

Anstruther-Gough-Calthorpe serves as a director for the Ellis Campbell Group and Hintlesham Holdings. He is also a trustee of the Elvetham Charitable Trust and the Newcastle Charitable Trust.

Anstruther-Gough-Calthorpe is the son of Sir Richard Anstruther-Gough-Calthorpe, 2nd Baronet, and Nancy Moireach Malcolmson.

He has been married twice. His first wedding took place at Kensington Register Office on 27 May 1977^[1] to socialite, débutante and banking heiress Lady Mary-Gaye Curzon (born 1947), daughter of the 6th Earl Howe and former wife of Kevin Esmond Peter Cooper-Key, whom she married in 1971 and divorced in 1976 and by whom she had a daughter, Pandora Cooper-Key (1973–2024), who worked at Vivienne Westwood. Anstruther-Gough-Calthorpe and his first wife, who were divorced in 1986, had three children:^{[citation needed]}

• Georgiana Moireach Gay Anstruther-Gough-Calthorpe (born 1978), artist
• Isabella Amaryllis Charlotte Anstruther-Gough-Calthorpe (born 1980), actress
• Jacobi Richard Penn Anstruther-Gough-Calthorpe (born 1983), property developer

In 1987 Anstruther-Gough-Calthorpe married Vanessa Mary Teresa Llewellyn Hubbard (born 1958), the former wife of Sir David Llewellyn, 4th Baronet. Anstruther-Gough-Calthorpe and his second wife are the parents of:

• Gabriella Zanna Vanessa Anstruther-Gough-Calthorpe (born 1989), actress and model
• Octavia Elsa Anstruther-Gough-Calthorpe (born 1991)

• Anstruther-Gough-Calthorpe baronets
• Anstruther baronets
• Baron Calthorpe
• Gough-Calthorpe family

• William Addams Reitwiesner. "Ancestry of Isabella Calthorpe"