Civil War Generals O (Union)
Text menu at bottom of page

| General's Index |
| OGLESBY, Richard James |
| OLIVER, John Morrison |
| OPDYKE, (Samuel) Emerson |
| ORD, Edward Otho Cresap |
| ORME, William Ward |
| OSBORN, Thomas Ogden |
| OSTERHAUS, Peter Joseph |
| OWEN, Joshua Thomas |
| Index | Generals | Admirals | Leaders | Units | Battles |
| Women | Flags | Names | Trivia | Songs | Magazines |
| Assorted | Parks | Organizations | Museums | Timeline | Overview |