Rosalyn Boulter was a British film actress, born on 1 February 1917 in Burton upon Trent, East Staffordshire. She married Stanley Haynes, a film writer, director and producer before having a daughter together, Carol, in 1942 or 1943.

Between 1935 and 1936 she featured in four West End productions shortly followed by her first 2 film roles, a romantic comedy called Love at Sea (1936) and a thriller called Holiday's End (1937). In 1937, she toured the UK and made her Broadway debut, playing the lead in the West End hit George and Martha. Boulder died on 6 March 1997 in Santa Barbara, California, United States.