Margaret Moyes Black (1853–1935) was a Scottish novelist and biographer. She was born on 27 April 1853 in the parish of Scoonie, Fife. Her father was William Black, a shipmaster,and her mother was Margaret Moyes Deas. She wrote her first novel, In Glenoran, under the pseudonym of M.B. Fife. She was unmarried and died on 16 October 1935 at Montrose, Angus.