Directory of Former Students of Harvard Living in 1919 - O
| Page # | Surname |
| Page 525 | Oak, Oakes |
| Page 526 | Oakford, Oakman, Oaks, Ober, Oberg, Oberholtzer, Oberman, O'Brian, O'Brien |
| Page 527 | O'Brien, O'Callaghan, O'Connell, O'Connor, O'Conor, O'Day, Odde, Odell, Odenwald |
| Page 528 | Odiorne, Odlin, O'Doherty, Odom, O'Donnell, O'Donoghue, O'Dowd, Oelrichs, Oenslager, Oerting, Oetiker, Officer, Offner, Offutt, O'Flaherty, Ogawa, Ogburn, Ogden, Ogg, Ogilby, Ogilvie, Oglesby, O'Gorman, O'Hara, Ohara |
| Page 529 | O'Hare, O'Hern, Ohl, Ohler, Ohlman, Ohlson, Ohsol, O'Keefe, O'Keeffe, Olch, Oldfather, Oldham, Olds, O'Leary, Oliphant, Olive |
| Page 530 | Olive, Oliver, Olivier, Olmstead, Olmsted, Olney, Olsen, Olson, Olsson, Olweiler, Olyphant, O'Malley |
| Page 531 | O'Mara, O'Meara, O'Mears, O'Melveny, Omita, Onativia, Onderdonk, O'Neil, O'Neill, Ong, Ono, Onorato, Onthank, Opdycke, Opdyke, Openhym, Oppenheim, Oppenheimer, Orcutt, Ordway |
| Page 532 | Ordway, Orear, O'Reilly, O'Riorden, Ormiston, Ormsby, Orr, Orrick, Orton, Orwig, Osborn, Osborne |
| Page 533 | Osborne, Osgood, O'Shea, Oshima, Oskison, Osler, Oslin, Osmond, Ostar, Oster, Ostergaard, Ostergren |
| Page 534 | Osthaus, Ostheimer, Ostrander, O'Sullivan, Otero y Galarraga, Otis, Ott, Otter, Otterson, Ottie, Ottis, Otto, Ouellet, Ouimet, Ould, Oulton, Outerbridge, Outland, Overholser, Overhott, Overlander |
| Page 535 | Overman, Overton, Oveson, Owen, Owens, Owings, Oqyang, Oxley, Oxnam, Oxnard, Oya, Oyler, Oyuela, Ozaki, Ozanne, Ozon |
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