A Short History and Illustrated Roster of the 105th Infantry, United States Army
- O'Berti, John
- O'Breiter, Harry
- O'Brien, James J.
- O'Brien, John
- O'Brien, John J.
- O'Brien, John J.
- O'Brien, Michael
- O'Brien, Terence J.
- O'Brien, William J.
- O'Connell, Frank
- O'Connell, John C.
- O'Connell, Roderick O.
- O'Conner, John J.
- O'Connor, Francis F.
- O'Connor, Fred W.
- O'Connor, Frederick V.
- O'Connor, Kevney
- O'Connor, Patrick F.
- O'Donnell, Frank
- O'Donnell, Michael S.
- O'Donnell, William J.
- O'Flaherty, John T.
- O'Grady, W.
- O'Haire, Leo G.
- O'Hea, John A.
- O'Leary, Charles D.
- O'Leary, Humphrey J.
- O'Leary, John A.
- O'Malley, Edward J.
- O'Meara, Edward
- O'Meara, John W.
- O'Neil, Bernard F.
- O'Neil, Owen J.
- O'Neil, Samuel J.
- O'Neil, Thomas
- O'Neil, William F.
- O'Neill, Charles
- O'Neill, Michael J.
- O'Sullivan, Frank J.
- O'Sullivan, M.
- Oaksford, Homer H.
- Oathout, Elmo E.
- Oatting, William H.
- Obrey, F. J.
- Ochs, Shea
- Ohlhausen, George N.
- Oktavec, G.
- Oliver, W.
- Olmstead, Harry C.
- Olmstead, T.
- Olsen, E. A.
- Olson, A. E.
- Olson, C. A.
- Olson, George E.
- Oreans, F.
- Ormond, J.
- Ormsby, Elmer H.
- Orr, Clarence J.
- Orr, James C.
- Orth, George J.
- Osborn, Herman F.
- Ostendorf, Andrew G.
- Osterhoudt, E.
- Osterhout, H. D.
- Oswald, William
- Ott, Charles J.
- Ott, George
- Ouimette, Henry J.
- Owens, G.
- Owens, Henry
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