Sir (Ernest) Gordon Cox TD KBE FRS (24 April 1906 – 23 June 1996) was a British crystallographer and structural chemist.
In 1927 Cox joined the team led by Professor Sir William Bragg FRS in the Davy-Faraday Laboratory at the Royal Institution in London where he worked on x-ray measurements of crystalline structures.
Cox joined the Territorial Army in 1936, but for the early war years remained at Birmingham to work on explosives.
In 1942 he became Senior Officer in charge of the laboratories of the Inter-Services Research Bureau (ISRB), which was a cover name for the Special Operations Executive (SOE).
Lucie died in 1962 and in 1968 Cox married Professor Mary Rosaleen "Jackie" Truter (nee Jackman) (subsequently Lady Cox), a former Leeds colleague and by then Deputy Director of the ARC Unit of Structural Chemistry at University College London.