This is the list of all Hockey Rookies with a lastname starting with "O"
| Will O'Brien | Matt O'Connor | Ryan O'Reilly |
| Terry O'Reilly | Adam Oates | John Ogrodnick |
| Kyle Okposo | Ed Olczyk | Gustav Olofsson |
| Bobby Orr | Chris Osgood | Alex Ovechkin |
| Alexander Ovechkin | Igor Ozhiganov |