Authors: O
- Oeser, Hermann 1849-1912
- Oesterley, W. O. E. (William Oscar Emil) 1866-1950
- Oetker, August 1862-1918
- Offenbach, Jacques 1819-1880
- Offenbecker, Larry 1913-2011
- Offen, Benjamin -
- Offor, George 1787-1864
- Offutt, Andrew J. 1934-2013
- O'Flaherty, Liam 1896-1984
- Ogden, Antoinette -
- Ogden, C. K. (Charles Kay) 1889-1957
- Ogden, George W. (George Washington) 1871-1966
- Ogden, Henry Alexander 1856-1936
- Ogden, Henry N. (Henry Neely) 1868-
- Ogden, Herbert G. (Herbert Gouverneur) 1846-1906
- Ogden, Ruth 1853-1927
- Ogg, Alexander -
- Ogg, Frederic Austin 1878-1951
- Ogilby, John 1600-1676
- Ogilvie, Campbell Patrick -
- Ogilvie, D. Douglas -
- Ogilvie-Grant, W. R. (William Robert) 1863-1924
- Ogilvie, John 1732-1813
- Ogilvie, J. S. (John Stuart) 1843-1910
- Ogilvie, Marilyn Bailey -
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