Gertrude Mary Hirst (January 22, 1869 – January 12, 1962), better known as G. M. Hirst, was an English-American classicist. Her most influential publication was her 1926 proposal (in Classical World vol. 19) that Livy was born in 64 BC, rather than the traditional date of 59 BC; this claim would later also be advocated by academics including Ronald Syme.