John Arnfield Heap, CMG (5 February 1932 – 8 March 2006) was an English polar scientist who helped protect Antarctica from exploitation.
John Heap was born in Manchester, England. He was educated at the Quaker-founded Leighton Park School in Reading and Edinburgh University where he studied geography. He began his career with pioneering research on Antarctic sea ice, for which he was awarded his doctorate at Clare College, Cambridge and the Scott Polar Research Institute (SPRI).
Dr Heap served with the Polar Regions Section of the Foreign and Commonwealth Office, and was head of the section between 1975 and 1992. He was than director of the SPRI in Cambridge from 1992 to 1997. After his retirement in 1997, he was chair of the UK Antarctic Heritage Trust and treasurer of the International Glaciological Society.
Heap married in 1961 and had a son and two daughters.