Dorothy Beatrice Spiers (née Davis; 25 May 1897 − 2 September 1977) was a British actuary. She was the first woman to qualify as an actuary in the United Kingdom. After studying mathematics at Newnham College, Cambridge, she worked for the Guardian Assurance Company. She passed the actuarial exams at the Institute of Actuaries in 1923. From the 1940s to 1954, Spiers worked part-time as an actuary for the Guardian Assurance Company, and Eagle Star Insurance. She was also the national treasurer of the League of Jewish Women. Spiers died on 2 September 1977 in Brent, Middlesex.