Index: Adams Family Correspondence, Volume 10, O
- Oeller, James (Phila. hotel keeper)
- Ohio
- Ohio (ship)
- O’Keeffe, John
- Oldenbarnevelt, Johan van (Dutch statesman)
- Old House (Peacefield, now Adams National Historical Park)
- Oneida County, N.Y.
- Orange, House of
- Orangist Party (also Stadholder, English, Court Party, Dutch)
- Orne, Col. Azor (of Marblehead)
- Osgood, Rev. David (of Medford)
- Osgood, Samuel (of N.Y.)
- Osterley Park (Brit. estate)
- Oswald, Richard (Brit. peace negotiator)
- Otis, Harriet (daughter of Samuel)
- Otis, Harrison Gray (Boston lawyer)
- Otis, Mary Ann (daughter of Samuel)
- Otis, Mary Smith Gray (wife of Samuel)
- Otis, Sally Foster (wife of Harrison)
- Otis, Samuel Allyne, Sr. (1740–1814, secy. of the Senate)
- Otis, Samuel Allyne, Jr. (1768–1814, son of Samuel, Sr.)
- Ottoman Empire
- Overflakkee Island, Netherlands