| Soldier | Company | |
|---|---|---|
| Oakes Francis J | G | |
| Oakum William R | B | |
| Obdyke Samuel V | I | |
| Oberg Edward W | E | |
| Oberlander William | MG | |
| O'Brien Edward F | H | |
| O'Brien Edward F | I | |
| O'Brien James A | H | |
| O'Brien Richard L | H | |
| O'Brien Robert E | HQ | |
| O'Brien William J | D | |
| Oclinskie John | M | |
| O'Connell Edward D | I | |
| O'Connell John A | G | |
| O'Connell Michael F | G | |
| O'Conner Charles A | A | |
| O'Conner James P (of MEUSE ARGONNE France) | M | |
| O'Conner James P (of Philadelphia, PA) | M | |
| O'Conner John J | B | |
| O'Conner Robert W | E | |
| O'Donnell James P | K | |
| O'Donnell John | A | |
| O'Donnell Leo | MG | |
| O'Donnell Patrick | M | |
| O'Donnell William | B | |
| O'Donnell William J | L | |
| O'Donohoe James J | H | |
| Ogden Stacey | D | |
| Ogren Aron R | F | |
| O'Hare Austin F | G | |
| Oldham Charles B | H | |
| Olean Joseph | H | |
| O'Leary Patrick F | M | |
| Olev Philip | B | |
| Olewiler Howard B | H | |
| Oliva Agostino | D | |
| Oliver James V | F | |
| Oliver John T | H | |
| Oliver Norris S | I | |
| Oliver William K | G | |
| Ollendorf William | E | |
| Olnig Harry | M | |
| Olshefsky John | G | |
| Olson Arthur W | K | |
| Olson Carl F | C | |
| Olson Frederick B | K | |
| Olson George F | SP | |
| Olson John W | BAND | |
| Olstein Matthew F | MD | |
| O'Malley Charles J | A | |
| O'Neal Leslie J | BAND | |
| O'Neil James G | B | |
| O'Neil John J | G | |
| O'Neil Michael J | H | |
| O'Neil James D | I | |
| O'Neil Joseph I | HQ | |
| O'Neill William A | D | |
| Opie John W | D | |
| Ore Orbie F | G | |
| Oreckinto Amerigo | M | |
| Oris Joseph J | SP | |
| Orlando Dominick | MG | |
| Orlando Pasquale | SP | |
| Orner William A | L | |
| Orr David | M | |
| Osborn Elijah E | K | |
| Osherovitz Issac | B | |
| Osman Thomas W | B | |
| Ossman Harrison G | D | |
| O'Sullivan Daniel A | G | |
| Oswald George F | D | |
| Otley Jesse D | A | |
| Otter Erich R | C | |
| Oury William H | SF |
(click for full-size image) |
| Otto Herman P L | L | |
| Ouelette Philip | C | |
| Ounan Edward A | B | |
| Ouzts Charles G | L | |
| Overcash Norman D | BAND | |
| Owen John T | I | |
| Owen Vincent L | SF | |
| Owens Charles J | E | |
| Owens Clarence A | I | |
| Owens Edward J | G | |
| Owens Fred | MG |