|Died||28 July 1938 (aged 26–27)
Cause of death
|Killed in action|
|Alma mater||Trinity College, Cambridge|
|Parent(s)||Leslie Haden-Guest, 1st Baron Haden-Guest & Muriel Ethel Carmel Goldsmid|
|Relatives||Peter Haden-Guest, 4th Baron Haden-Guest (brother)|
Guest was the son of Leslie Haden-Guest, 1st Baron Haden-Guest. He entered Trinity College, Cambridge, in 1929 and studied from 1930 to 1931 in Göttingen in Germany, where he became involved in anti-Nazi politics, and joined the Communist Party at Cambridge in 1931.
He became the head of a cell that included John Cornford, Guy Burgess, Donald Maclean, Victor Kiernan and James Klugmann.  This enabled dons such as Maurice Dobb and John Bernal to take a back-seat. It was claimed that David Guest would "stride into hall at Trinity wearing a hammer and sickle pin in his lapel." 
- Today we have certainly entered a period of crisis, when the arguments of 'normal times' no longer apply, when considerations of most immediate usefulness come in. That is why I have decided to take the opportunity of going to Spain.
After his death, notes he had made while lecturing at the Marx Memorial Workers' School were published as A Text Book of Dialectical Materialism in 1939.
- Guest, David, (1939) A Text Book Of Dialectical Materialism, Lawrence And Wishart (republished as Lectures On Marxist Philosophy (1963))
- Biography of David Guest
- Phillip Knightley, Philby: KGB Masterspy (1988) page 32
- Sugarman, Martin (2012). "Against Fascism - Jews who served in The International Brigade in the Spanish Civil War". Jewish Virtual Library. Retrieved 6 April 2012.
- Carmody, Jim; Baxell, Richard (2012). "List of those who died in Spain". International Brigade Memorial Trust. Retrieved 6 April 2012.
- Jenkins, Nicholas (2012). "David Haden-Guest". W.H. Auden - Family Ghosts. Retrieved 6 April 2012.
- Beaumont, Peter (1 May 2005). "Forgotten warriors return to battle sites". The Guardian (London: GMG). ISSN 0261-3077. OCLC 60623878. Retrieved 6 April 2012.
- "TEACHER KILLED IN SPAIN - David Guest, British Communist, Fought With Loyalists". The New York Times. 7 August 1938. Retrieved 6 April 2012.
- Works by or about David Guest in libraries (WorldCat catalog)
- Walker, Michael. "David Guest". A Compendium of Communist Biographies.
- Guest, Carmel Hayden (1939) David Guest - A Scientist Fights For Freedom 1911-1938, Lawrence and Wishart.