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