 | O'Daniel, John W., Jr. | | 20-09-1944 |  |
| O'Brien, Henry J. | | |  |
| O'Brien, Terence M. | | 03-03-1945 |  |
 | O'Brien, William J. | 00-00-1899 | 07-07-1944 |  |
| O'Brien, William P. | | |  |
 | O'Bryan, Joseph R. | | | |
| O'Bryant, Virgil L. | | | |
| O'Connell, Robert | | | |
 | O'Daniel, John Wilson "Iron Mike" | 15-02-1894 | 27-03-1975 |   more |
| O'Dea, Cifford J. "John" | | 12-04-1945 | |
| O'Dell, Loren E. | | | |
| O'Donovan, John F. | | | |
| O'Farrell, Hugh R. | 11-05-1914 | |  |
| O'Farrell, Rufus E. | 24-07-1917 | 10-04-1943 | |
| O'Flaherty, William J. | | | |
| O'Grady, David Thomas | 25-03-1924 | 17-12-1944 | |
| O'Keefe, Arthur J. | | | |
| O'Keefe, Patrick S. "Patty" | 03-04-1926 | 08-02-2003 |     |
| O'Leary, Donoval L. | | | |
| O'Leary, Frank | | 23-11-1944 | |
| O'Neill, John J. | | | |
| O'Neill, William J. | | | |
| Oakley, Benjamin T. | | | |
| Oaks, Orville | | | |
| Oberg, Oliver E. | | | |
| Obernolte, Clyde H. | | |  |
 | Obourn, Robert Lyle | 20-01-1919 | 27-03-1992 |  |
| Ochacher, Hyman | | | |
| Odegard, Henry O. | | | |
| Oden, Delk McCorkle | 13-07-1911 | 13-06-1997 | |
| Ofchinick, Richard P. | | 18-09-1944 | |
| Ogburn, William R. | 04-07-1920 | | |
 | Ogden, Carlos Carnes | 09-05-1917 | 02-04-2001 |  more |
 | Ogden, David Ayres Depue | 16-10-1897 | 26-11-1969 | |
| Ogden, Hayes Chick | 00-00-1918 | 12-08-1944 | |
| Ogden, Raymond | | | |
| Oglensky, David | | 25-02-1945 | |
| Ohama, Abraham G. "Abe" | | 20-10-1944 | |
 | Ohata, Allan M. | 13-09-1918 | 17-10-1977 |  |
| Oiye, George "Whitey" | 19-02-1922 | |  |
| Okubo, James K. | 30-05-1920 | 29-01-1967 |  |
 | Okutsu, Yukio | 03-11-1921 | 24-08-2003 | |
| Oleson, John E. | | | |
| Oliver, Bernard J. | | 25-02-1945 | |
| Oliver, Raymond L. | | | |
 | Oliver, Thomas W. | 17-03-1923 | 17-12-1944 | |
| Olsen, Barney | | 10-02-1945 | |
| Olsen, Fred J. | | | |
| Olsen, John | | | |
| Olsen, William B. | | | |
 | Olson, Arlo L. | 20-04-1918 | 27-10-1943 | |
| Olson, Halbert E. | | | |
 | Olson, Truman O. | 13-10-1917 | 30-01-1944 | |
 | Onana, Ralph Wheeler (O'Nan) | 06-10-1935 | 01-11-1965 |    |
| Ono, Frank H. | 05-06-1923 | 06-05-1980 | |
| Oot, Earl L. | | | |
| Opdyke, Chester P., Jr. | | | |
 | Oresko, Nicholas | 18-01-1917 | 04-10-2013 | |
| Orr, Albert I. | | | |
| Orr, Ray F. | | | |
| Ortego, Ralph | | | |
| Ortiz, Ernesto S. | | | |
| Orvin, Louis Ernest, Jr. "Lukie" | 20-03-1922 | 04-12-2008 | |
| Osborne, John Donald | 07-10-1917 | 17-12-1944 | |
| Oshlo, Richard C. "Dick" | 26-02-1921 | 30-05-1975 |   |
| Osiek, Leonard F. | | 31-07-1944 |  |
| Oskins, Robert D. | | | |
| Ostberg, Edwin J. | | | |
| Ostrom, Charles E. | | 20-09-1944 | |
 | Otani, Kazuo | 02-06-1918 | 15-07-1944 | |
| Otsuka, Jiro | 06-04-1923 | 03-06-1944 | |
| Ott, Edward V. | 16-02-1915 | 19-02-1999 | |
 | Otter, Bethel Veech | 12-09-1914 | 06-05-1942 |  |
| Ouden, den, Marinus Petrus Antonius | 21-08-1909 | 12-02-1951 |        more |
| Ouderkirk, Orvest Miles | | | |
 | Ouellette, Raymond L. | 21-03-1921 | 20-05-1943 | |
| Overman, Ellis | | | |
 | Owens, Claude Calvin | 23-12-1920 | 30-11-1944 | |
| Owens, Ralph | | | |
| Ownby, Bryan | | | |
| Owned, Bryan | | | |
| O’Toole, Joseph P. | | | |
