Mary Duffy
- Born: 12 Feb 1882, Port Glasgow, Renfrewshire, Scotland
- Marriage: John Clenaghan on 26 Oct 1903 in Port Glasgow, Renfrewshire, Scotland
- Died: 11 Apr 1955, Coatbridge, , Lanark, Scotland at age 73
 Noted events in her life were:
• Scottish Census, 5 Apr 1891, Port Glasgow, Renfrewshire, Scotland. 9
• Scottish Census, 31 Mar 1901, Port Glasgow, Renfrewshire, Scotland. 3
• Witnessed: Thomas McDonald and Elizabeth Quinn Wedding, 1903.
Mary married John Clenaghan, son of John Clenaghan and Mary Keegans, on 26 Oct 1903 in Port Glasgow, Renfrewshire, Scotland. (John Clenaghan was born on 25 Mar 1883 in Old Monkland, , Lanark, Scotland and died on 3 Jul 1918 in Port Glasgow, Renfrewshire, Scotland.)
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