Margaret Emma Faith Irwin (1889 — 11 December 1969) was an English author of several important historical novels, as well as a factual biography of Sir Walter Raleigh.
Her novels were esteemed for the accuracy of their historical research, and she became a noted authority on the Elizabethan and early Stewart era. One of her novels, Young Bess about the early years of Queen Elizabeth I, was made into a movie starring Jean Simmons.