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- Ophel Hill11
- Our Lady of the Lake Catholic Church, (Lake Oswego, OR)11
- Old South Church (Boston, Mass.)7
- Oxyrhynchite Nome4
- Obadiah (Biblical prophet)3
- Old South Congregational Church (South Weymouth, Weymouth, Mass.)3
- Olive oil presses3
- Ovens3
- Overpopulation3
- Oaths2
- Old South Congregational Church (Farmington, Me.)2
- Old South Union Congregational Church (Weymouth, Mass.)2
- Old West Church (Calais, Vt.)2
- Original Congregational Church (Wrentham, Mass.)2
- Orp, William2
- Orphanages2
- Orphans2
- Osiris (Egyptian deity)2
- Ouseley, Frederick Arthur Gore, Sir, 2d bart., 1825-18892