Last names starting with "O"
- Class of 1977 Nettie O'bryant
- Class of 1960 Diane Oakley
- Class of 2004 Jerrolyn Ochampaugh
- Class of 1979 Mark Oisten
- Class of 1986 Sarah Oisten
- Class of 2005 Tabatha Oisten
- Class of 1987 Virginia Oisten
- Class of 1989 Charles Olsen
- Class of 1996 Sandy Om
- Class of 1988 Trevor Orr
- Class of 1963 Jan Orton
- James Osman
- Class of 1989 Julie Osman
- Trina Osten
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About the Allegan High School Alumni Directory
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