Pilot Officer Ralph Otto Gustaf Häggberg was a Swedish airman of the Royal Air Force Volunteer Reserve who was killed during the Second World War.

Häggberg, born on 14 March 1922 and a student in Britain, was on school leave in Sweden when the Second World War began. He returned to Britain and volunteered in 1940, joining 263 Squadron as a pilot. With the squadron, Häggberg operated Westland Whirlwinds over occupied Europe and in the seas around Britain.

In October 1941, he transferred to 137 Squadron, which was equipped with Whirlwinds. Häggberg and three other pilots were killed on 12 February 1942 when their squadron was unexpectedly engaged by Luftwaffe aircraft covering the German battleships Scharnhorst and Gneisenau during their "Channel Dash" The squadron had been assigned as escort to two flotillas of Royal Navy destroyers.

He has no known grave and commemorated by the Runnymede Memorial.