Last names starting with "O"
- Class of 1961 David Oatley
- Class of 1983 Michelle Oatley
- Class of 1970 Roberta Oatley
- Class of 1982 Scott Oatley
- Class of 1985 Collean Obrien
- Class of 1998 Jessica OConnell
- Class of 1992 Sean OConnor
- Timothy Odum
- Class of 1962 Irene Oja
- Class of 1994 Tara Okoney
- Class of 1984 Paul Orzulak
- Danny Ouellette
- Class of 1992 Kerry Ouellette
- Richard Ouellette
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About the Killingly High School Alumni Directory
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