- O'Shaughnessy, Drew1
- O'Shea, Kelly1
- O'Sullivan, Abby1
- O'Toole, Dillion1
- Ocasio, Mason1
- Offstein, Ryan1
- Ogren, Fiona1
- Ogren, Liam1
- Ohlson, Carolynn1
- Okafor, Chima1
- Okafor, Chisom1
- Okray, Brandon1
- Olaya, Grace1
- Oldridge, Eamon1
- Olgado, Nicholas1
- Olguin, Kate1
- Oliver, Erik1
- Olsen, Jake1
- Olsen, Lily1
- Olson, Caleb1