Martyn John Dunne, CNZM, QSO (born 16 January 1950) is a retired New Zealand Army officer, a diplomat and senior public servant.

In September 1999, Dunne led the New Zealand Force East Timor during New Zealand's largest deployment since World War II, and as the Senior National Officer and, with the rank of brigadier, commanded the Dili Command, an operational formation in the International Force East Timor, until 2000.

In July 1989, Dunne was appointed commandant of the Officer Cadet School in Waiouru and promoted to lieutenant colonel.

He was promoted to the rank of major general on 2 April 2001 prior to assuming his appointment as Commander Joint Forces New Zealand (COMJFNZ), which post he held until 2004.

He was made a Companion of the New Zealand Order of Merit in the 2000 Queen's Birthday Honours, following his service in East Timor.