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- Okin, Susan Moller 1946-2004
- Okoampa-Ahoofe, Kwame, Jr. 1963–
- Okorafor-Mbachu, Nnedi
- Okri, Ben 1959-
- Olasky, Marvin 1950-
- Old Age Sticks
- Old Ironsides
- Old, Wendie C(orbin) 1943-
- Oldfield, A(rthur) Barney 1909-2003
- Oldfield, Jenny 1949-(Lucy Daniels, Kate Fielding, Fiona Kelly)
- Oldham, Nick 1956-
- Oldman, Mark 1969(?)-
- Oldmixon, Elizabeth Anne 1974(?)–
- Oldridge, Darren 1966-
- Olds, Sharon 1942-
- Oldstone, Michael B.A.
- Olegario, Rowena
- Oleksiw, Susan (Prince) 1945-
- Oleksiw, Susan 1945–
