Sir Alan Sterling Parkes, FRS, CBE (10 September 1900 – 17 July 1990) was an English reproductive biologist credited with Christopher Polge and Audrey Smith for the discovery that spermatozoa can be protected against induced damage induced by freezing and low-temperature storage using glycerol.

[1] This work enabled the development of the field of cryobiology.

[2] Hall was educated at Willaston School.

[3] He published on the reproductive effects of X-rays on mice, hormonal control of secondary sexual characteristics in birds, and aided Hilda Bruce in research that established the Bruce effect.

[2][4] In 1962, Parkes was awarded the Cameron Prize for Therapeutics of the University of Edinburgh.