| SURNAME | FIRST NAME | CEMETERY | TOWN | WAR |
| O'Brian | Leon | NEILLSVILLE CITY | PINE VALLEY | WW 2 |
| O'Brian | Robert | NEILLSVILLE CITY | PINE VALLEY | WW 2 |
| O'Reilly | Thomas J. | ST. MARY'S | PINE VALLEY | WW 1 |
| O'Reilly | Lawrence P. | ST. MARY'S | PINE VALLEY | WW 2 |
| Oatman | George Isaac | YOLO | FREMONT | CIVIL WAR |
| Oberbillig | Mathias | DORCHESTER MEM | MAYVILLE | CIVIL WAR |
| Oberle | Blasius | ST. BERNARD | WITHEE | WW 1 |
| Ockershauser | Karl | BEAVER | BEAVER | WW 2 |
| Ockershauser | Karl | BEAVER | BEAVER | WW 2 |
| Oelig | William | GREENWOOD CITY | EATON | CIVIL WAR |
| Oens | Edwin | YOLO | FREMONT | CIVIL WAR |
| Oestreich | Donald G. | ST. ANTHONY | LOYAL | KOREA |
| Oestreich | Robert C. | LOYAL LUTHERAN | LOYAL | WW 1 |
| Oestreich | Bernard | LOYAL LUTHERAN | LOYAL | WW 2 |
| Oestreich | C. Neil | LOYAL LUTHERAN | LOYAL | WW 2 |
| Ohlinger | Bert | ST. MARY | COLBY | WW 1 |
| Ohlinger | Lawrence | ST. MARY | COLBY | WW 1 |
| Oldham | Michael R. | LEVIS | LEVIS | VIETNAM |
| Oldham | Marvin Lee | LEVIS | LEVIS | NOT GIVEN |
| Olejnicza | Andrew | E. THORP VILLAGE | WITHEE | WW 2 |
| Olsen | Norman Victor | ABBOTSFORD CITY | MAYVILLE | WW 2 |
| Olsen | Conrad C. | LOYAL LUTHERAN | LOYAL | WW 2 |
| Olson | Todd | LOYAL LUTHERAN | LOYAL | IRAQ |
| Olson | Charles Dell | ABBOTSFORD CITY | MAYVILLE | WW 1 |
| Olson | Henry | LOYAL CITY | LOYAL | WW 2 |
| Olson | Roy E. | GREENWOOD | EATON | WW 2 |
| Olson | Wayne | PINE HILL | MAYVILLE | WW 2 |
| Ondal | Robert N. | BUTLER | BUTLER | VIETNAM |
| Oniszcuk | Carl | NEW ST HEDWIGS | WITHEE | WW 1 |
| Opelt | John C. | WINDFALL | GRANT | VIETNAM |
| Ormond | William | NEILLSVILLE CITY | PINE VALLEY | WW 2 |
| Orth | Conrad Jr. | ST. MARY | COLBY | WW 2 |
| Orth | Norman Mathias | ST. MARY | COLBY | WW 2 |
| Ortlieb | Rudolph | DORCHESTER MEM | MAYVILLE | WW 1 |
| Osborne | Donald L. | ST. BERNARD | WITHEE | WW 2 |
| Osowski | Edward | NEW ST. HEDWIG'S | WITHEE | WW 2 |
| Otrin | Fred F. | RIVERSIDE | HIXON | WW 2 |
| Owen | Verne M. (?) | LOYAL CITY | LOYAL | WW 1 (?) |
| Owens | Pierce E. | RIVERSIDE | HIXON | WW 1 |
Updated 12/14/2005
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