Pierre Audouin (1768–1822)
Kristijanas Vilhelmas Ernstas Ditrichas (1712-10-30–1774-04-24)
Adolf Obst (1869-08-27–1945)
Gérard Audran (1640-08-02–1703-07-25)
Johann Leonard Oexlein (1715–1787)
Mykolas Kleopas Oginskis (1765–1833)
Antonis Oleščinskis (1794–1879)
Severinas Oleščinskis (1801–1876)
Juozapas Oleškevičius (1777–1830-10-05)
Franz Omaglige (?) (XIX a. II p.–XX a. pr.)
Max Oppenheimer (1885-07-01–1954-10-19)
Matthew Orante (?–2008)
Napoleonas Orda (1807-02-19–1883-04-26)
Gediminas Orentas (1915-02-14–2007-02-07)
Emil Orlík (1870-07-21–1932-09-28)
Aleksander Orłowski (1777-03-09–1832-03-13)
Jonas Orvidas (1875–1942)
Vilius Orvidas (1952-08-18–1992-08-05)
A. Osiecimski
Mečislovas Ostrauskas (1927-01-17–2002-01-07)
Tomas Ostrauskas (g. XIX a.)
Valerija Ostrauskienė (1927-10-29–1997-08-11)
Julius Karolis Ostrovskis (1854-01-14–1917-03-12)
Ernst Otto (1866-12-28–1927)
Jean-Baptiste Oudry (1686-03-17–1755-04-30)
O. Ouverdross (?) (g. XIX a. II p. – XX a. pr.)
Antoon Overlaet (1720-12-21–1774-12-17)
Józef Oziębłowski (1805-05-11–1878-09-09)