Jan Oszmianec
Lev Оšanin (1912–1996)
Hirš Ošerovič (1908–1994)
Jadvyga Oškinaitė-Sutkuvienė (1895-08-10–1964-02-08)
Vincas Oškinis (1892-05-01–1971-12-06)
Leonas Oštorpas (1786–1851)
Konstantinas Otoselskis (1755–1809)
Jan Szczepan Otrębski (1889–1971)
Georg Ots (1920-03-21–1975-09-05)
Karl Ots (1882-08-18–1961-02-04)
Ernst Otto (1866-12-28–1927)
Indulis Otto (1947–2006)
Adolfas Otto Pattas (g. 1893-09-25)
Jean-Baptiste Oudry (1686-03-17–1755-04-30)
Jean Jacques Outhwaite (1815 ?–1877)
O. Ouverdross (?) (g. XIX a. II p. – XX a. pr.)
Nar Ovanisian (1913–1995)
Dimitrijus Ovcinas (1704–1757)
Jegoras Ovčarenko
Johann Friedrich Overbeck (1789–1869)
Antoon Overlaet (1720-12-21–1774-12-17)
Ernst Ovesén
Saparmyrat Ovezberdi (1939-02-21–2009-06-19)
Ovidijus (43 pr. Kr.–17 ?)
Tadeušas Ovsianas
Jurij Ovsianikov (1926–2001)
Jan Felicjan Owidzki (1852-06-09–1913-06-01)
Eduardas Ozarskis (1908-01-01–1981-08-06)
Toshiki Ozawa (1932–2014)
Karolis Augustas Ozelis (1857–1951)
Grigorij Ozerov (1940–2004)
Lev Ozerov (1914-08-23–1996-03-18)
Izrail Ozerskij (1901–1971)
Jonas Ozgirdas (1931–2022-04-15)
Józef Oziębłowski (1805-05-11–1878-09-09)
Romualdas Ozolas (1939-01-31–2015-04-06)
Miervaldis Ozoliņš (1922-03-19–1999)
Tomislav Ožanić
Grigorij Ože (1834–~1906)
Sofija Oželienė (1900–1994)
Kazys Oželis (1886-06-23–1960-03-03)
Elena Oželytė-Lomsargienė (g. 1890)
Pranciškus Ožemblovskis
Elena Samaniūtė (1910-03-29–1982-06-29)
Steven Cornelisz van Herwijck (~1530–~1567 (ar 1565))