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- Obadiah (Biblical prophet)3
- Obelisk2
- Ocmulgee Baptist Church (Ocmulgee, Ala.)2
- October3
- Old South Church (Boston, Mass.)7
- Old South Congregational Church (Farmington, Me.)2
- Old South Congregational Church (South Weymouth, Weymouth, Mass.)3
- Old South Union Congregational Church (Weymouth, Mass.)2
- Old West Church (Calais, Vt.)2
- Oldcastle, John, Sir, -14173
- Olive2
- Olive oil presses3
- Ophel Hill11
- Orb10
- Orchards2
- Ordination14
- Original Congregational Church (Wrentham, Mass.)2
- Orphanages7
- Orphans6
- Orthodox Eastern churches17