Helen Laura Farquhar (1859 – 1953) was a British numismatist and a founder member of the British Numismatic Society in 1903. Farquhar served on the British Numismatic Society Council many times from 1910-1946 and was Vice-President at various times 1912-1953. Farquhar specialised in British numismatics, especially Stuart portraiture and the Touch pieces associated with the King's Evil (scrofula). Farquhar wrote prolifically on these subjects, particularly in the British Numismatic Journal where she published articles in every volume from 1905-1930.