Irina Odoyevtseva (1895-1990) – a poet and author of memoirs. Born in Riga into the family of lawyer Gustav Heinike. >>
Alexander Ogurtsov (1939- 2017) – lawyer for defence. >>
Vasily Oknov (1830-1894) – Russian Orthodox priest, archpriest, translator and publisher of liturgical books, including in Latvian. >>
Nikolai Adamovich Okolo-Kulak (1867-1927) – a mechanical engineer, inventor, state councilor, head of the main Riga workshops of the Riga-Oryol railway, founder and director of the Russian Technical School in Riga. >>
Boris Oks (1928-2012) – Habilitated Doctor of Engineering, professor of the Riga Technical University. >>
Vladimir Okun (1943) – a soloist of the Latvian Opera, director.
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Alexander Olbik (1939-2018) – a journalist and writer. >>
Sergey Oleynikov (1919-2004) – a sworn advocate. >>
Afanasy Ordin-Nasсhokin (1605-1680) – Russian diplomat and politician in the reign of Alexey Mikhailovich. Russian vaivode of Koknese (Kokenhusen). >>
Leonid Orekhov (1930-2007) – Doctor of Engineriing, Docent of the Riga Technical University. >>