Sister Mary may refer to:
Arts Sister Mary (album), album by Irish singer Joe Dolan "Sister Mary" (song), title track of above album Sister Mary (film), 2011 American comedy musical film directed and written by Scott Grenke
People known as Sister Mary Sister Mary Ignatius Davies (1921−2003), Jamaican nun Sister Mary Celine Fasenmyer (1906–1996), American nun and mathematician Sister Mary Laurence (1929–2024), New Zealand nun Sister Mary Leo (1895–1989), New Zealand nun Sister Mary Irene FitzGibbon (1823–1896), England-born American nun Sister Mary Melanie Holliday (1850–1939), American nun Kathleen O'Melia (1869–1939), English-born Canadian sister known as Sister Mary Stella and Sister Mary of the Angels
See also Sister Mary Ignatius Explains It All for You, 1979 stage play by Christopher Durang Sister Mary Explains It All, 2001 film adaptation of above and directed by Marshall Brickman Sister Mary Elephant, a comedy skit by Cheech and Chong