Index: Adams Family Correspondence, Volume 14, O
- Oder River
- Ogden, Rev. John Cosens (of New Haven)
- Old House (Peacefield, now Adams National Historical Park)
- Oliver, Andrew, Jr. (Mass. judge)
- Oliver, Mary (in Atkinson, N.H.)
- Oliver, Mary Lynde (wife of Andrew, Jr.)
- Oracle and Daily Advertiser (London)
- Order of Malta
- Orléans, Louis Philippe, Duc d’ (son of Philippe Égalité)
- Orleans, Louis Philippe Joseph, Duc d’ (Philippe Égalité)
- Orozco, Nicolás Blasco de (Spanish diplomat)
- Osgood, Samuel (of N.Y.)
- Otis, Harrison Gray (Mass. representative)
- Otis, Mary Smith Gray (wife of Samuel, Sr.)
- Otis, Samuel Allyne, Sr. (secy. of the Senate)
- Ottoman Empire
- Otway, Thomas
- Ovid
- Oxford, Mass.