Note: an (FX) denotes a Foriegn exchange student. An asterisk (*), or (school name) means the student left Cromwell before graduation, but may have photos in the Early years. A () link goes to a page showing related students.
O
O'Brien
O'Connell
- Samantha 2012
O'Connor
- Charles 1974 (Xavier)
- Jason 2011
- Kelli 2009
- Kristen 2006
- Liam 2018
- Ryan 2010
- Samantha 2012
- Thomas 1978 (Xavier)
O'Keefe
O'Malley
O'Neill
- Cassandra 2017
O'Rourke
O'Toole
Oathout
- Kimberly 1986
Odoardi
- Alfred 1979 (Vinal)
- Leanne 1976 (Mercy)
Ogwu-Weekes
- James 2007
Olander
- Madison 2019
Oldman
Oliveira
Oliver
- Judith 1980
Ollari
Olmeda
- Jessica 2016
Olsen
Olson
- Emily 2017
Oman
- Peter 1999
Omeragic
Omicioli
Onesti
- Paola 1983
Organek
Orlacchio
Orleanu
- Florian 2010
Ortiz
Osara
Osborn
- Karen 2004
Oslander
Oslund
- Harry 1959
Osora
- Matthew 2016
Ostergren
Osterling
- Barry 1967
- Christer 1994
- Courtny 1996
- Greg 1974
- Jason 1999
- Jeremy 2001
- Roger 1969
- Shannon 2002
- Sherry 1969
Ostiguy
- Justin 2003
Oszurek
- Barbara 1968 (Mercy)
Otfinoski
Ouelette
Ousley
- Michael 2006
Overend
Owen
Owens
- Dennis 1992
Ozga
- Margaret 1998