- O'Brien, Ally
- O'Brien, Anne
- O'Brien, Caragh
- O'Brien, Kevin
- O'Dell, Tara
- O'Farrell, Maggie
- O'Flanagan, Sheila
- O'Keefe, Molly
- O'Neal, Barbara
- O'Reilly, Judith
- O'Riley, Kaitlin
- O'Rourke, Sally
- Ockler, Sarah
- Odell, Jeri
- Oelker, Petra
- Oke, Janette
- Oltmanns, Jutta
- Omari, Laila El
- Orenstein, Peggy
- Orlowski, Britta
- Orwig, Sara
- Osterwald, Pia
- Owens, Robin D.
- Owens, Sharon
- Owens, Zahra