Last names starting with "O"
- Kathleen O'neil
- Class of 1969 Kathy Occhuizzo
- Class of 1990 Julie Oconnell
- Class of 1966 Mary Frances OConnell
- Class of 1975 Diane Ohler
- Class of 1955 Audrey Ohlmer
- Class of 1999 Tiffany Oler
- Class of 1967 Thomas Omalley
- Class of 1974 Kathy ONeil
- Class of 1975 Sharon Onoffrey
- Class of 1993 Stacey Oooooooo
- Class of 1973 John Opar
- Class of 1986 Robby Orbin
- Keith Orr
- Billy Oskey
- Class of 1970 Christina Fait Ostertag (formerly Fait)
- Mack Overly
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