Mary Knight Wood Mason (17 April 1857 – 20 December 1944) was an American pianist, music educator and composer. She was born in Easthampton, Massachusetts, the daughter of Lieutenant-governor, manufacturer and philanthropist Horatio G. Knight and Mary Ann Huntoon Knight. She was educated at Charlier Institute in New York City and Miss Porter's School in Farmington, Connecticut, studying music with Karl Klauser, Benjamin Johnson Lang and Henry Holden Huss.
Knight married Charles Greenleaf Wood of Boston in 1879, and Alfred Bishop Mason of New York in 1914, after which she lived in New York City and summered at a cabin in the Catskill Mountains. She died in Florence, Italy.
Wood published about fifty songs. Selected works include:
Her music has been recorded and issued on CD, including: