Mary Elizabeth Adams Brown (1842–1918) was an American writer, collector, and curator of musical instruments.

She is best known for her collection of musical instruments that she donated to the Metropolitan Museum of Art.

She worked together with her son, who made the drawings used to illustrate her catalog of instruments.

The Crosby Brown Collection of Musical Instruments, named for her husband John Crosby Brown, became one of the world's most historic and comprehensive collections of musical instruments.

[1] It started with an impressive donation of 270 instruments mostly from the Far East, Middle East, Africa, and the Pacific Islands in 1889 that were accompanied with the stipulation that she and her son could add to the collection and replace items with items of equal importance but superior quality.