| O Dell Cemetery - Sidon, Mississippi, United States | O J Mooney Family Cemetery - Sylacauga, Alabama, United States |
| O X Cemetery - Bruneau, Idaho, United States | O Zion Cemetery - Smithdale, Mississippi, United States |
| O'Banion Cemetery - , , | O'Bannon Cemetery - Liberty, Missouri, United States |
| O'Berry Cemetery - White Oak, Georgia, United States | O'Brien Cemetery - Elm Grove, Illinois, United States |
| O'Brien Cemetery - Holton, Indiana, United States | O'Brien Cemetery - , , |
| O'Brien Cemetery - Hudson, Ohio, United States | O'Brien Cemetery - Bremo Bluff, Virginia, United States |
| O'Brien Cemetery - Machias, Maine, United States | O'Brien Cemetery - Lovilia, Iowa, United States |
| O'Brien Cemetery - , Florida, United States | O'Bryan Cemetery - Pesotum, Illinois, United States |
| O'Bryan Cemetery - Charleston, Missouri, United States | O'Bryant Cemetery - , , |
| O'Byrne Cemetery - , , | O'Connor Cemetery - Sparta, Tennessee, United States |
| O'Connor Cemetery - Victoria, Texas, United States | O'Connor Cemetery - O'Connor, Ontario, Canada |
| O'Daniel Cemetery - Dry Branch, Georgia, United States | O'Daniel Cemetery - Hopkinsville, Kentucky, United States |
| O'Dea Cemetery - Ulysses, Kansas, United States | O'Dear Cemetery - Sewanee, Tennessee, United States |
| O'Dell Cemetery - Wykoff, Minnesota, United States | O'Dell Cemetery - Newport, Tennessee, United States |
| O'Dell Cemetery - Norwalk, Ohio, United States | O'Dell Cemetery - Dayton, Oregon, United States |
| O'Donely Cemetery - La Center, Kentucky, United States | O'Donniley Cemetery - Hurricane Mills, Tennessee, United States |
| O'Fallon Cemetery - O'Fallon, Illinois, United States | O'Ferrell Cemetery - Dickson, Tennessee, United States |
| O'Grady Cemetery - Grand River, Iowa, United States | O'Guin Cemetery - Hohenwald, Tennessee, United States |
| O'Guinn Cemetery - Waverly, Tennessee, United States | O'Hair Cemetery - Paris, Illinois, United States |
| O'Hara Cemetery - Princeton, Kentucky, United States | O'Hare Place Cemetery - Dorchester, Iowa, United States |
| O'Haver Cemetery - , , | O'Kelley Cemetery - Candler, North Carolina, United States |
| O'Kelly Cemetery - Mason, Tennessee, United States | O'Kelly cemetery - Mayfield, Kentucky, United States |
| O'Mary Cemetery - Winfield, Alabama, United States | O'Mary Cemetery - , , |
| O'Neal Cemetery - , , | O'Neal Cemetery - Athens, Alabama, United States |
| O'Neal Cemetery - Danville, Alabama, United States | O'Neal Cemetery - LaGrange, Georgia, United States |
