Geoffrey Harber Diggle (6 December 1902 – 13 February 1993) was a British chess player and writer. Diggle contributed articles to the British Chess Magazine (BCM) from 1933 to 1981, and to the British Chess Federation's publications Newsflash and Chess Moves from 1974 to 1992. C.H.O'D. Alexander called Diggle "one of the best writers on chess that I know". In his A Book of Chess, Alexander reproduced in toto Diggle's account, first published in the November and December 1943 BCM, of the match between Staunton and St. Amant.