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. >>

Mikhail Orlov (1918-1944) – the Great Patriotic War (World War II) Participant, Hero of the Soviet Union. Born in Latgale (East Latvia). >>

Oleg Orlov (1947)  – a vocalist, tenor, soloist of the Latvian National Opera, soloist of the Tallinn National Opera, soloist of the Krakow Philharmonic, vocal teacher at the Latvian National Opera. >>

Nina Orlova (1894-1980) –  a teacher of Russian language. >>

Zoya Orlova (1924-2005) – a Chief Physician of the Riga City 1st Clinical Emergency Hospital (1st Riga City Hospital) from 1972 to 1994. >>

Alexander Orlovsky (1867-1944) – a teacher of Russian language and literature, Headmaster of Riga 9^th Russian Elementary school. >>

Eugenia Oshurkova (1951) – a bard and journalist. >>

Leonid Osipov (1917-2011) – Professor of Riga the Technical University, Doctor of chemistry (Dr. chem). >>

Maxim Osmidov (Max von Osmidoff; 1879-1952) – an architect. >>