Revolutionaries and activists
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- OkinoerabujimaOkinoerabujima (沖永良部島, Okinoerabu: いぃらぶ Yirabu, archaic Northern Ryukyuan: せりよさ Seriyosa),
- Oliver Hazard PerryUnited States Navy officer (1785–1819)
- Oliver NorthAmerican military figure (born 1943)
- Olšany CemeteryOlšany Cemeteries (Czech: Olšanské hřbitovy, German: Wolschaner Friedhof) is the largest g
- Omar BradleyUnited States Army general (1893–1981)
- Order of Blue Sky and White SunThe Order of Blue Sky and White Sun with Grand Cordon (Chinese:青天白日勳章 or 青天白日勛章) is the Re
- Order of Independence and FreedomOrder of Independence and Freedom (Chinese: 独立自由勋章; pinyin: Dúlì Zìyóu Xūnzhāng) was a mil
- Order of Liberation (China)Order of Liberation (Chinese: 解放勋章; pinyin: Jiěfàng Xūnzhāng) was a Chinese military award
- Order of the Black StarThe Order of the Black Star (Ordre de l'Étoile Noire) was an order of knighthood establish
- Order of the German EagleThe Order of Merit of the German Eagle (German: Verdienstorden vom Deutschen Adler) was an
- Order of the Golden KiteThe Order of the Golden Kite (金鵄勲章, Kinshi Kunshō) was an order of the Empire of Japan, es
- Oskar DirlewangerGerman military officer and war criminal (1895–1945)
- Oskar von SperlingOskar Ernst Karl von Sperling (31 January 1814 in Kölleda – 1 May 1872 in Dresden) was a G
- Oswald BoelckeOswald Boelcke PlM (German: ; 19 May 1891 – 28 October 1916) was a World War I German prof
- Otelo Saraiva de CarvalhoPortuguese military officer and politician (1936–2021)
- Otto CariusGerman tank commander
- Otto SkorzenyAustrian Waffen-SS officer (1908–1975)
- Ōyama IwaoJapanese general (1842–1916)