Sir Robert George Mappin Fenwick KNZM KStJ (5 May 1951 – 11 March 2020) was a New Zealand environmentalist, businessman and professional director.

Fenwick co-founded the organic composting service Living Earth Ltd, the NZ Natural bottled water brand and Te Matuku Oysters[1] and held a number of board and advisory panel positions.

The Crest of Fenwick is Upon a Wreath of the Colours In front of a Phoenix Sable rising from Flames proper four Mullets Argent.

[16] In 1990, Fenwick commenced a series of consulting roles and professional directorships providing corporate strategy, government relations and communications advisory services to a range of organisations, generally focussing on sustainability and environment issues management.

[citation needed] Notable positions include: Fenwick was appointed leader of the Progressive Green Party in 1996 and campaigned to create a Maritime Park in the Hauraki Gulf.

[32] In 1997 Fenwick and businessman colleague John Beattie bought Queen Mary Hospital in Hanmer Springs after the local health authority wanted to close it.

[33] Fenwick's motivation was because he had had a close family member treated at Queen Mary, which was a national residential treatment centre for alcoholism and addictions.

[33] While the hospital continued to receive government funding Fenwick and Beattie also hoped to attract private fee-paying patients from within New Zealand and overseas.

During his term the agency constructed wind powered turbines to supply energy to the New Zealand and US research stations and the Hillary Science Centre was completed at Scott Base.