Last names starting with "O"
- Marilyn O'brien
- Class of 1987 Richard O'Donnell
- Class of 1971 Maureen O'Mergenhagen (formerly Furmanek)
- Class of 1940 Bernice Oaks
- Class of 1957 John OBrien
- Class of 1972 Gail ODell
- Class of 1967 Roberta Oliver
- Class of 1951 Mary Ondrejka
- Class of 1993 William ONeill
- Charlotte Orlowski
- Class of 2000 Angel Ortiz
- Class of 1972 Elizabeth Ortiz
- Class of 1991 Rachel Ortiz
- Class of 1969 Beverly Orzulak
- Class of 1983 Rodney Orzulak
- Class of 1971 Shirley Orzulak
- Class of 1965 Karen Osing
- Class of 1963 Sally Ott
- Class of 1984 Wendy Owens
- Class of 1981 Frieda Owensby
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