Peter John Cartwright CNZM QSO CStJ (3 May 1940 – 17 April 2019) was a New Zealand lawyer and, as the husband of Dame Silvia Cartwright, viceregal consort of New Zealand between 2001 and 2006.

[4][5] Cartwright served on the boards of IHC New Zealand and the Donald Beasley Institute, and was chair of the latter for several years.

[4] He also chaired the Medical Practitioners Disciplinary Tribunal, the Indecent Publications Tribunal and the Broadcasting Standards Authority, was a member of the Accident Compensation Appeal Authority, and patron of Citizen Advocacy Auckland.

[4][5] In 1969, Cartwright married Silvia Rose Poulter who, as Silvia Cartwright, became the first female High Court judge in New Zealand, and who was appointed as the 18th Governor-General of New Zealand in 2001, serving until 2006.

[7] In 2001, Cartwright was appointed a Commander of the Order of St John.