George Alan Martin Cross FRS (born 27 September 1942) is a British molecular parasitologist. He has been André and Bella Meyer Professor of Molecular Parasitology at Rockefeller University since 1982. He was elected as a Fellow of the Royal Society in 1984. He was educated at Cheadle Hulme School and Downing College, Cambridge. He was awarded the Paul Ehrlich and Ludwig Darmstaedter Prize (jointly with Prof. Piet Borst) in 1984.

Cross was the first to isolate variant surface glycoproteins.