Helen Florence Roberts (15 July 1912 – 12 December 2010), later known as Betty Roberts and by her married name, Betty Walker, was an English singer and actress, best known for her performances in soprano roles of the Savoy Operas with the D'Oyly Carte Opera Company.After beginning her career touring in Italy and then England in grand opera, Roberts joined the D'Oyly Carte Opera Company as a principal soprano in 1938.