Last names starting with "O"
- Class of 1995 David O Hearn
- Class of 2003 Sarah O Rielly
- Class of 1988 Lisa O'Brien
- Class of 1979 Colleen O'conners
- Class of 1985 Noreen O'Hara
- Class of 1985 Michelle O'Leary
- Class of 1976 Ann O'Rourke (now Anzalone)
- Class of 1977 Peter Oconnell
- Class of 1975 Jackie Odonell
- Class of 1999 Shayna Odonohue
- Class of 2010 Breanah Ohandley
- Dave Ohearn
- Class of 1995 David Ohearn
- Class of 2011 James Okeefe
- Class of 1991 Kevin Oloughlin
- David Osgood
- Class of 2004 Timothy Osgood
- Candace Owen
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About the Methuen High School Alumni Directory
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