Last names starting with "O"
- Amanda O'brien
- Christopher O'keefe
- Class of 1996 Heather Olbrook
- Mark Olivia
- Class of 1983 Theresa Ollila
- Class of 2007 Kristie Olney
- Class of 1990 Sonya Olsen
- Class of 1985 Eric Olson
- Class of 1989 Chad Oman
- Class of 1989 Chad Omen
- Class of 1984 Anthony Ordway
- Tony Ordway
- Class of 1996 Omara Otero (now Casazza)
- Class of 1996 Jason Ottariano
- Denise Ouellet
- Class of 1980 David Ouellette
- Andrea Oulette
- Class of 1982 Michele Oulette
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About the Londonderry High School Alumni Directory
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