Mary Kelly may refer to:
- Mary Jane Kelly (1863–1888), widely believed to be the fifth and final victim of Jack the Ripper
- Mary Kelly (writer) (born 1927), Scottish writer
- Mary Kelly (artist) (born 1941), American artist and writer
- Mary Kelly (handballer) (born 1985), Australian handball player
- Mary Kelly (politician) (born 1952), Irish Labour Party politician, Member of the 20th Seanad
- Mary Beth Kelly, justice on the Michigan Supreme Court
- Mary Eva Kelly (1826–1910), Irish poet and writer
- Mary Louise Kelly, National Public Radio's senior Pentagon correspondent
- Mary Kelly (camogie)
Famous quotes containing the word mary:
“The back meets the front.”
—Hawaiian saying no. 2650, ‘lelo No’Eau, collected, translated, and annotated by Mary Kawena Pukui, Bishop Museum Press, Hawaii (1983)