Index: Papers of John Adams, Volume 14, O
- Ohio
- Oldenbarnevelt, Johan van (Dutch statesman)
- Old House (Peacefield; now Adams National Historical Park)
- Olive Branch Petition (1775)
- Oliver, Andrew (former lt. gov. of Mass.)
- Ontario, Canada
- Oosterbaan, Prof. Heere (of Amsterdam)
- Orange, House of
- Orange County, N.J.
- Ormonde, James Butler, 1st Duke of
- Osgood, Samuel (Mass. member of Congress)
- Ossory, Thomas Butler, Earl of
- Ostend, Belgium
- Osterman, Ivan A. (Russian vice-chancellor)
- Oswald, Richard (Brit. peace negotiator)
- Otis, James, Jr. (the Patriot)
- Otis, Samuel Alleyne (Boston merchant)
- Ottoman Empire (Sublime Porte)
- Overijssel (province of the Netherlands)
- Overijssel (Dutch naval vessel)
- Ovid