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. >>

Andrey Osokin (1984) – a pianist. >>

Sergey Osokin (1960) – professor, one of the best Latvian pianists. >>

Yelena (Alyona) Ostapenko (1997) – a tennis player. >>