| | Name | Rank | ASN | Unit | Campaign | | Olsufka, Louis M. | Pvt | 17040963 | 119/C | |
| Olszak, Joseph S. | Sgt | 32364697 | 119/G | |
| Olts, Allen Al. | | | 117 | |
| Oltz, Allen M. | Pvt | 42111085 | 117 | |
| Olup, Richard J. | | | Div Arty/Hq Btry | |
| Olup, Richard J. | | | | |
| Olvader, George W. | Pfc | | 743 Tank/Hq | |
| Olvany, John P. | Pvt | 32828108 | 119/Unk Co | |
| Olyphant, George | | | 743 Tank/Unk Co | |
| On 7 August (1944) in France, set up mortar to repel furious enemy conterattack. BS | 1, 38, 123/22, 30th Div Mess. Brd. | 2 | | |
| Onak, John | Cpl | | 743 Tank/A | |
| Onderdonk, George G. | 1st Lt | O | 531 AAA/Btry B | |
| Ondre, Joseph J. | Capt | O | 743 Tank/Unk Co | |
| Oney, James B. | Pfc | 35678009 | 119/I | |
| Opaiser, Emil, Jr. | Pfc | 7032292 | 120/Unk Co | |
| Opp, George W. | Rct | | 117/Medic | |
| Oppedisano, August P. | Pfc | | 119/Unk Co | |
| Opry, Vurnice | | | 531 AAA/Btry D | |
| Oquist, Raymond A. | T/4 | | 823 TD/B | |
| Orahood, Edwin R. | Pvt | 35613926 | 120/I | |
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