Surnames Starting with O
| Name | Country | Category | Gender | Birth | Death |
| O'Callahan, Joseph | United States | Military-Sea | Male | 1905 | 1964 |
| O'Connor, Richard | United Kingdom | Military-Ground | Male | 1889 | 1981 |
| O'Kane, Richard | United States | Military-Sea | Male | 1911 | 1994 |
| Obata, Hideyoshi | Japan | Military-Ground | Male | 1944 | |
| Oesch, Lennart | Finland | Military-Ground | Male | 1892 | 1978 |
| Ogawa, Kiyoshi | Japan | Military-Air | Male | 1945 | |
| Ohara, Hisashi | Japan | Military-Sea | Male | ||
| Okada, Jisaku | Japan | Military-Sea | Male | ||
| Okamura, Yasuji | Japan | Military-Ground | Male | 1884 | 1966 |
| Oktyabrsky, Filipp | Russia | Military-Sea | Male | 1899 | 1969 |
| Okumiya, Masatake | Japan | Military-Sea | Male | ||
| Oldendorf, Jesse | United States | Military-Sea | Male | 1887 | 1974 |
| Omori, Sentaro | Japan | Military-Sea | Male | 1892 | 1974 |
| Onishi, Takijiro | Japan | Military-Air | Male | 1891 | 1945 |
| Oppenheimer, Robert | United States | Science-Engineering | Male | 1904 | 1967 |
| Osborne, William | United States | Military-Ground | Male | 1913 | 1985 |
| Oshima, Hiroshi | Japan | Government | Male | 1886 | 1975 |
| Osmeña, Sergio | Philippines | Government | Male | 1878 | 1961 |
| Osterkamp, Theodor | Germany | Military-Air | Male | 1892 | 1975 |
| Ota, Minoru | Japan | Military-Sea | Male | 1891 | 1945 |
| Otani, Kazuo | United States | Military-Ground | Male | 1918 | 1944 |
| Oulds, D. C. | United Kingdom | Photography | Male | ||
| Oumansky, Constantine | Russia | Government | Male | ||
| Ozawa, Jisaburo | Japan | Military-Sea | Male | 1886 | 1966 |
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