Mary O'Connor
Mary O'Connor may refer to:
Arts and media
- Mary O'Connor, a poor servant, subject of the 19th century Irish ballad "The Rose of Tralee"
 - Mary O'Connor (died 2013), Hugh Hefner's secretary, frequent guest on The Girls Next Door
 - Mary-Anne O'Connor, Australian novelist 
- "There's Something About Mary O'Connor", episode of The Girls Next Door
 
 - Mary Flannery O'Connor (1925–1964), American writer
 - Mary H. O'Connor (1872–1959), American screenwriter and film editor
 - Mary Murillo (1888–1944), born Mary O'Connor, English-born U.S. actress turned screenwriter
 
Politics
- Mary O'Connor (Illinois politician) (born 1959), Chicago alderman
 - Mary Mitchell O'Connor (born 1959), politician
 
Sportswomen
- Mary O'Connor (runner) (born 1955), retired long-distance runner from New Zealand
 - Mary O'Connor (Irish sportsperson) (born 1977), camogie and Gaelic football player and official
 - Mary Anne O'Connor (born 1953), American Olympic basketball player
 - Mary I. O'Connor (born c. 1959), U.S. Olympic team rower and orthopedic surgeon
 
Other people
- Mary Agnes O'Connor (1815–1859), Irish Sisters of Mercy nun and social worker
 - Mary O'Connor, a relevant party to the court case Matter of O'Connor, 1988
 
Fictional characters
- Mary O'Connor, in the 1920 US drama film The Prince of Avenue A, played by Cora Drew
 - Mary O'Connor, in the UK soap opera London Bridge, played by Simone Lahbib
 - Mary Anastasia O'Connor, the character Maisie Ravier's alter ego in the Maisie series of films