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Civil War Soldiers, Allen County, Indiana
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| Oakley | Chauncey B. | Capt. | 88th Reg. Infantry | E | 3 years | |
| Oakley | Chauncey B. | Adjutant | 139th Reg. Infantry | | 100 days | |
| Oakley | Chauncey B. | Lieut. Col. | 142nd Reg. Infantry | | 1 year | |
| Ober | Alonzo O. | Pvt | 142nd Reg. Infantry | F | 1 year | |
| Oberholtzer | Samuel | Pvt | 142nd Reg. Infantry | F | 1 year | |
| Oberly | Christian | Pvt | 12th Reg. Infantry | B | 3 years | |
| O'Brian | John | Pvt | 12th Reg. Infantry | H | 3 years | |
| O'Brian | William | Pvt | 12th Reg. Infantry | H | 3 years | |
| Oceleston | Thomas | Pvt | 152nd Reg. Infantry | G | 1 year | |
| O'Connell | John | 1st. Lieut. | 88th Reg. Infantry | F | 3 years | |
| O'Connor | Cornelius | Pvt | 142nd Reg. Infantry | E | 1 year | |
| O'Connor | John | Pvt | 9th Reg. Infantry | E | 3 months | |
| O'Dair | John | Pvt | 30th Reg. Infantry | E | 3 years | |
| O'Dair | William | Pvt | 30th Reg. Infantry | E | 3 years | |
| Oerting | Henry | Pvt | 142nd Reg. Infantry | C | 1 year | |
| Ogden | John W. | Pvt | 12th Reg. Infantry | B | 3 years | |
| O'Grady | Henry | Pvt | 44th Reg. Infantry | G | 3 years | |
| O'Harra | Charles | Pvt | 12th Reg. Infantry | H | 3 years | |
| Olds | Eli | Pvt | 30th Reg. Infantry | A | 3 years | |
| Olds | John D. | Sgt. | 74th Reg. Infantry | C | 3 years | |
| O'Leary | Michael | Pvt | 35th Reg. Infantry | C | 3 years | 1st Irish |
| Oliphant | Luther M. | Pvt | 55th Reg. Infantry | E | 3 months | |
| Oliver | Drewery H. | Pvt | 139th Reg. Infantry | H | 100 days | |
| Opity | Herman | Pvt | 13th Reg. Infantry | B | 3 years | |
| Opleger | Daniel | Pvt | 55th Reg. Infantry | E | 3 months | |
| Oplinger | Daniel | Pvt | 11th Battery Lt. Art. | | 3 years | |
| Oplinger | George W. | Corp. | 91st Reg. Infantry | H | 1 year | |
| Oplinger | George W. | Pvt | 124th Reg. Infantry | D | 1 year | |
| Orbison | John T. | Corp. | 55th Reg. Infantry | E | 3 months | |
| Orff | John | Pr. Musician | 32nd Reg. Infantry | | 3 years | 1st German |
| Orin | James | Pvt | 30th Reg. Infantry | E | 3 years | |
| Ormiston | Alexander | Pvt | 44th Reg. Infantry | C | 3 years | |
| Orn | Nelson H. | Pvt | 74th Reg. Infantry | C | 3 years | |
| Ort | William | Corp. | 142nd Reg. Infantry | F | 1 year | |
| Ortstedt | Henry | Pvt | 91st Reg. Infantry | H | 1 year | |
| Osborn | William G. | Pvt | 55th Reg. Infantry | E | 3 months | |
| Osborne | William E. | Pvt | 11th Reg. Infantry | E | 3 years | |
| O'Shaugnessy | James | 1st Lieut. | 12th Reg. Infantry | F | 1 year | |
| O'Shaugnessy | James | 2nd Lieut. | 12th Reg. Infantry | K | 3 years | |
| Osman | Jesse | Pvt | 137th Reg. Infantry | E | 100 days | |
| Otto | Herman | Pvt | 11th Battery Lt. Art. | | 3 years | |
| Otto | John | 1st. Lieut. | 11th Battery Lt. Art. | | 3 years | |
| Ouk | Christian | Pvt | 11th Battery Lt. Art. | | 3 years | |
| Overly | Daniel | Pvt | 90th Reg. 5th Cavalry | D | 3 years | |
| Overly | David H. | Pvt | 142nd Reg. Infantry | C | 1 year | |
| Overly | Isaac | Pvt | 90th Reg. 5th Cavalry | D | 3 years | |
| Overly | Jacob | Corp. | 12th Reg. Infantry | K | 3 years | |
| Overly | James | Pvt | 142nd Reg. Infantry | E | 1 year | |
| Overly | Thomas | Pvt | 90th Reg. 5th Cavalry | D | 3 years | |
| Overly | Thomas D. | Pvt | 142nd Reg. Infantry | D | 1 year | |
| Overly | William | Pvt | 90th Reg. 5th Cavalry | D | 3 years | |
| Overly | Isaac, Sr. | Pvt | 90th Reg. 5th Cavalry | D | 3 years | |
| Overman | Charles | Pvt | 139th Reg. Infantry | H | 100 days | |
| Owens | David C. | Pvt | 90th Reg. 5th Cavalry | D | 3 years | |
| Owens | Owen | Pvt | 55th Reg. Infantry | E | 3 months | |
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