Mary Arnold

Mary Arnold may refer to:


 * Mary Arnold (tennis) (1916–1975), American tennis player
 * Mary Anne Arnold (c. 1825–?), English sailor and crossdresser
 * Mary Arnold (singer) (born 1947), American singer
 * Mary Daisy Arnold (1873–1955), American botanical artist
 * Mary Ellicott Arnold (1876–1968), American social activist, teacher and writer
 * Mary Peterson Arnold (1885–1973), American politician
 * Mary Augusta Ward (née Arnold; 1851–1920), British writer