Mark Gillachrist Marlborough Pryor (25 February 1915 – 19 October 1970) was a British biologist, who was Senior Tutor and Fellow of Trinity College, Cambridge. Pryor was the middle son of Lt. Col. Walter Marlborough Pryor and his wife Ethne Philippa (née Moore), the daughter of Sir Norman Moore, 1st Baronet. His paternal grandfather was Marlborough Robert Pryor, who was an amateur naturalist "well known in Cambridge scientific circles". He was educated, per family tradition, at Eton and Trinity College, Cambridge. He worked as a research student under A.D. Imms.