| | Name | Rank | ASN | Unit | Campaign | | O'Neill, Paul H. | Pvt | | 743 Tank/D | |
| O'Neill, William J. | 1st Lt | | 117/1st/Hq,117/A | R,A,NF |
| O'Quin, Otis W. | Pvt | | 117/B | |
| O'Reilly, John J. | TSgt/Lt | 36557702/O | 119/C/2nd Plt | |
| O'Rourke, Cormack J. | Pvt | 32855450 | 117/C | NF,R,A,CE |
| O'Rourke, James E., Jr. | 1st Lt | O-1284381 | 118 Inf/F, 118 Inf/G | |
| O'Shea, Gilbert A. | Pvt | 17056628 | 119/2nd | |
| O'Shea, Joseph T. | Pfc | | 119/Unk Co | |
| O'Shea, Norman | 1st Lt | O | 120/I | |
| O'Steen, Orville K. | 2nd Lt. | O | 119/Unk Co | |
| O'Sullivan, Cornilius F. | Pfc | 33585581 | 119/L | |
| Oakes, Clinton L. | | | 119/Unk Co | |
| Oakes, Gordon H. | Pvt | | 113 FA/Unk Co | |
| Oakes, John H. | 2nd Lt | O | 119/CN | |
| Oakes, Waymon | Pc | 39159062 | 120/B | |
| Oakley, Annas A. | Pfc | 37698854 | 120/B | |
| Oakley, Dale W. | T/4 | | Recon | |
| Oakley, Vernon L. | Pvt | 35077893 | 117 | |
| Oakley, William L. | Cpl | 34884338 | 120/Hq | |
| Oaks, Ernest Y. | Pvt | | 117/AT | |
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