Sabrina Bicknell (1757 – 8 September 1843), better known as Sabrina Sidney, was a British woman abandoned at the Foundling Hospital in London as a baby, and taken in at the age of 12 by author Thomas Day, who tried to mould her into his perfect wife. She grew up to marry one of Day's friends, instead, and eventually became a school manager. In 1804, Anna Seward published a book about Sidney's upbringing. Edgeworth followed up with his memoirs, in which he claimed Sidney loved Day. Sidney herself, on the other hand, said she was miserable with Day and that he treated her as a slave.