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| O Murchi, Nora (1) | O'B, A. (1) | O'Brien, Clancy (1) |
| O'Brien, Caragh M. (1) | Flann O'Brien [pseud.] (1) | O'Brien, Meghan (1) |
| O'Brien, Mary (1926-1998) (1) | O'Brien, Michael [David] (1) | Robert C[arroll] O'Brien [pseud.] (1) |
| O'B[rien], A[lexander] (1) | O'Connell, Jay (1) | O'Connor, Anthony (1) |
| O'Den, Daniel (1) | O'Donnel, Manus (1) | O'Donnell, Kevin Jr. (1950-2012) (4) |
| Lawrence O'Donnell [pseud.] (2) | O'Donnell, Margaret (1) | O'Dowd, Bernard [Patrick] (1866-1933) (1) |
| O'Duffy, Eimar [Ultan] (1893-1935) (3) | O'Flaherty, Liam (1896-1984) (1) | O'Grady, Standish James (1846-1928) (1) |
| O'Hara, Dan (6) | O'Hara, Kimball (1) | O'Hara, Robert (1) |
| O'Hearn, Claudine Chiawei (1) | O'Leary, Patrick (b. 1952) (1) | James O'Neal [pseud.] (1) |
| O'Neil, Dennis [Joseph] (b. 1939) (1) | O'Neil,, Henry [Nelson] A.R.A. (1817-80) (1) | O'Neill, David P[atrick] (b. 1946) (1) |
| O'Neill, Gene (b. 1938) (1) | O'Neill, Gerard K[itchen] (1927-92) (1) | O'Neill, Joseph (1) |
| O'Neill, [John] Joseph (1886-1953) (1) | O'Reilly, Elaine (b. 1942) (1) | O'Reilly, Finbarr (1) |
| O'Reilly, Ian (1) | O'Reilly, John Boyle (1844-1890) (1) | O'Sheel, Shaemas (1886-1954) (1) |
| O'Sullivan, Rev. P. P. (1874-1918) (1) | O'Sullivan, Vincent [Gerard] (b. 1937) (1) | Oakhurst, William (1) |
| Oakley, Nicholas P. (2) | Oakley, Ryan (1) | Oates, Joyce Carol (b. 1938) (1) |
| Ober, Damien Lincoln (1) | Oberndorf, Charles [G.] (b. 1959) (2) | Oboler, Arch (1907-87) (1) |
| Ocampo, Victor Fernando R. (2) | John October [pseud.] (1) | An Octogenarian [pseud.] (1) |
| Odell, S. W. (1) | Odell, S[amuel] W. (1864-1948) (1) | Offenhuber, Dietmar (1) |
| Offutt V, Andrew J[efferson] (1934-2013) (2) | Offutt [V], Andrew J[efferson] (1934-2013) (1) | Ofsthun, Carl M. (b. 1885?) (1) |
| Ogden, Aimee (7) | Ogilvy, James (1) | Oh, Axie (1) |
| Ohle, David (b. 1941) (4) | Oilar, Forrest Loman (b. 1880) (1) | Ojetade, Balogun (3) |
| Ojikutu, Bayo (b. 1971) (1) | Ok, Cindy (1) | Okogu, Efe Tokunbo (1) |
| Okogu, Efe [Tokunbo] (1) | Okorafor, Nnedi[mma Nkemdili] (b. 1974) (13) | Okorafor-Mbachu, Nnedi[mma Nkemdili]] (b. 1974) (4) |
| Okri, Ben (b. 1959) (4) | Olander, Joseph D[avid] (b. 1939) (2) | An Old Colonist [pseud.] (1) |
| An Old Pauper [pseud.] (1) | Old Reformer [pseud.] (1) | Older, Daniel José (b. 1980) (3) |
| Older, Malka [Ann] (b. 1977) (9) | Oldrey, John (1) | Olerich, Professor Henry (1851-1927) (1) |
| Olerich, Henry (1851-1927) (4) | Olive, Rob (1) | Oliver, Ben (1) |
| Oliver, Chad (2) | Lauren Oliver [pseud.] (1) | Oliver, M. (1) |
| Oliver, M[ichael] (1) | Oliver, [Symmes[ Chad[wick] (1928-1993) (2) | Ollivant, Alfred (1874-1927) (1) |
| Olofinlua [Amogunla], Temitayo (2) | Olsen, Lance (b. 1956) (4) | Olsen, Rodger (1) |
| Olson, Elder (1909-92) (1) | Oltion, Jerry [Brian] (b. 1957) (1) | Olukotun, Deji Bryce (2) |
| Omega [pseud.] (1) | Omen, Edward [pseud?] (1) | Omolodun, Olateju (1) |
| One J. M. [pseud.] (1) | One of His Majesty’s Justices of Peace for the County of Lanark [pseud.] (1) | One of the Late Most Reputed Wits [pseud.] (1) |
| One of Them [pseud.] (1) | One Who Has Seen Them [pseud.] (1) | One Who Knows [pseud.] (1) |
| One who resided many years on the Spot [pseud.] (1) | One Who Was There [pseud.] (1) | Oni, Abiola (1) |
| Onions, Oliver (1) | Onions, [George] Oliver (1873-1961) (1) | Onopa, Robert (b. 1943) (1) |
| Onorato, Jeffrey A. (1) | Onwualu, Chinelo (3) | Onyebuchi, Tochi [Joshua] (b. 1987) (4) |
| Mr. Onyx [pseud.] (1) | Opal, Lady Porstock [pseud.] (1) | Oppenheim, E[dward] Phillips (1886-1946) (1) |
| Oppenheim, E. Phillips (1) | Opperman, B. (1) | Oram, Stephen (6) |
| Orange, Tommy (b. 1982) (1) | Orcutt, Emma Louise (1) | Rebecca Ore [pseud.] (2) |
| Oreskes, Naomi (b. 1958) (1) | Orgill, Douglas (b. 1922) (1) | Orio, Miguel (1) |
| Orjas, Jeane (1) | Orkow, Ben [Harrison] (1896-1988) (1) | Ormand, Kate (1) |
| Orner, Peter (1) | Orpen, Mrs. [Adela Elizabeth] (1855-1928) (1) | Orr, Paul (1) |
| Orr, Violet (1918-76) (1) | Ortega, Joshua (1) | Orvis, John (1816-97) (1) |
| George Orwell [pseud.] (2) | Osborn, E. M. (1) | Osborn, E[dith] M. (b. 1902) (1) |
| Osborn, [Robert Chesley] (1904-1994) (1) | David Osborne [pseud.] (1) | Osborne, Heather (1) |
| Osborne, Richard (1) | Osborne, William (b. 1960) (2) | Oshiro, Mark (1) |
| Osias, Kate (3) | Osier, John (b. 1938) (1) | Osundare, Niyi (b. 1947) (1) |
| Oswald, Felix L[eopold] (1845-1906) (1) | Otiri, Godfrey (b. 1942) (1) | Otis, Abbey Mei (b. 1989) (2) |
| Ott, Charles (1) | Otto, Erik A. (3) | Oughton, John (1) |
| Ould, Chris (b. 1959?) (1) | Our Roving Correspondent [pseud.] (1) | Our Very Special, Special Correspondent [pseud.] (1) |
| Outhwaite, Paul (1) | Ovaere, Marten (1) | Overmyer, Eric [Ellis] (b. 1951) (1) |
| Ow, Anya (2) | Owen, Albert Kimsey (1847-1916) (1) | Owen, Claire Myers Spotswood (1) |
| Owen, Robert (1771-1858) (10) | Owens, Clarke W. (b. 1951) (1) | Owomoyela, An (2) |
| John Oxenham [pseud.] (1) | Oyiliagu, Catherine (1) | Özgürel, Cansu Çakmak (1) |
| Ozmon, Howard [Augustine] [Jr.] (1929-2014) (1) | O’Brien, M. E. (1) | O’Callaghan, Cian (1) |
| O’Dine, Virginia (1) | Finn O’Donnevan [pseud.] (1) | O’Driscoll, Mike (1) |
| Right Hon. Phineas O’Flannagan , Late Secretary of State for Foreign Affairs [pseud.] (1) | O’Meara, Shauna (1) | O’Neill, Louise [Anne] (b. 1985) (1) |
