O
- Vladimir Obruchev, geologist and writer (1963)
- Alexander Odoyevsky, Russian poet (1952)
- Georgy Oppokov, politician (1988)
- Sulkhan-Saba Orbeliani, Georgian writer (1959)
- Mammed Said Ordubadi, Azeri writer (1972)
- Grigory Ordzhonikidze, politician (1952, 1958, 1966, 1986)
- Kirill Orlovsky, World War II partisan (1970)
- Polina Osipenko, aviatrix (1939)
- Mikhail Ostrogradsky, Russian mathematician (1951)
- Alexander Ostrovsky, Russian playwright (1948, 1949, 1959, 1973)
- Georg Ots, Estonian singer (1980)
Read more about this topic: List Of People On Stamps Of The Union Of Soviet Socialist Republics