Authors
Karl Oberste-Brink (Ob.-Brink) fl. 1914
Jiří Obrhel (Obrhel) *1933 - †1996
Dorothy Z. Oehler (D.Z.Oehler) fl. 1978
D.J Ohlsen (D.J.Ohlsen)
Daniel Ohlsen (Ohlsen)
Takeshi (Takashi) Ohsawa (Tak.Ohsawa) fl. 1989
Naiara C. Oliveira (Oliveira)
Eduardo B. Olivero fl. 2018
M.S. Onyike (Onyike)
Stanislav Opluštil (Opluštil) *1962
Emanuel Opravil (Opravil) *1933 - †2005
Olga A. Orlova (O.A.Orlova) fl. 2019
Berlaine Ortega-Flores (Ortega-Flores)
Erika Lourdes Ortiz Martinez (Ort.Mart.) fl. 2024
Alexei A. Oskolski (Oskolski) *1962
Peter Osterloff (Ost.) fl. 2018
Ernst von Otto (E.Otto) *1799 - †1863
Eduardo Guillermo Ottone (Ottone)
Shu Ouyang (S.Ouyang) fl. 2018