| Osadchiy Ivan Mikhaylovich b. 25.06.1981 · Registered · LDPR | Regional assembly, Novosibirsk Oblast, 2005 11.12.2005 · Novosibirsk Oblast |
| Osadchuk Andrey Mikhaylovich b. 1972 · Registered · United Russia | Regional assembly, Khanty-Mansi Autonomous Okrug – Yugra, 2026 20.09.2026 · Khanty-Mansi Autonomous Okrug |
| Osetrov Vladimir Ivanovich b. 02.01.1951 · Registered · CPRF | Regional assembly, Kirov Oblast, 2006 12.03.2006 · Kirov Oblast |
| Osetrov Yuriy Anatolevich b. 1967 · Registered · A Just Russia | Regional assembly, Belgorod Oblast, 2025 14.09.2025 · Belgorod Oblast |
| Osinina Olga Alekseevna b. 15.07.1978 · Registered · CPRF | Regional assembly, Nizhny Novgorod Oblast, 2006 12.03.2006 · Nizhny Novgorod Oblast |
| Osipov Aleksandr Nikolaevich b. 26.08.1953 · Registered · CPRF | Regional assembly, Saint Petersburg, 2007 11.03.2007 · Saint Petersburg |
| Osipov Vasiliy Vasilevich b. 23.09.1953 · Registered · Rodina | Regional assembly, Chuvash Republic, 2006 08.10.2006 · Chuvash Republic |
| Osipov Vladimir Vasilevich b. 27.03.1958 · Registered · Rodina | Regional assembly, Tambov Oblast, 2005 18.12.2005 · Tambov Oblast |
| Osipov Vyacheslav Vasilevich b. 10.04.1954 · Registered · CPRF | Regional assembly, Mari El Republic, 2004 10.10.2004 · Mari El Republic |
| Osipov Vyacheslav Vasilevich b. 10.04.1954 · Registered · CPRF | Regional assembly, Mari El Republic, 2004 10.10.2004 · Mari El Republic |
| Osipov Evgeniy Yurevich b. 1977 · Registered · United Russia | Regional assembly, Omsk Oblast, 2026 20.09.2026 · Omsk Oblast |
| Osipov Egor Vladimirovich b. 2003 · Registered · A Just Russia | Regional assembly, Kaluga Oblast, 2025 14.09.2025 · Kaluga Oblast |
| Osipov Nikolay Petrovich b. 20.05.1954 · Registered · Rodina | Regional assembly, Belgorod Oblast, 2005 16.10.2005 · Belgorod Oblast |
| Osipova Aleftina Aleksandrovna b. 08.03.1939 · Registered · Party of Pensioners | Regional assembly, Mari El Republic, 2004 10.10.2004 · Mari El Republic |
| Osipova Tatyana Aleksandrovna b. 05.05.1950 · Registered · Patriots of Russia | Regional assembly, Ivanovo Oblast, 2005 04.12.2005 · Ivanovo Oblast |
| Osipova Tatyana Yurevna b. 05.08.1964 · Registered · CPRF | Regional assembly, Krasnoyarsk Krai, 2007 15.04.2007 · Krasnoyarsk Krai |
| Osipova Tatyana Yurevna b. 05.08.1964 · Registered · CPRF | Regional assembly, Krasnoyarsk Krai, 2007 15.04.2007 · Krasnoyarsk Krai |
| Osipova Elina Khachimovna b. 2000 · Registered · New People | Regional assembly, Republic of Adygea, 2026 20.09.2026 · Republic of Adygea |
| Osipovich Viktor Viktorovich b. 03.07.1960 · Registered · LDPR | Regional assembly, Moscow, 2005 04.12.2005 · Moscow |
| Osiyuk Aleksandr Viktorovich b. 21.04.1951 · Registered · CPRF | Regional assembly, Kaluga Oblast, 2004 14.11.2004 · Kaluga Oblast |
| Osiyan Vladimir Vasilevich b. 12.10.1946 · Registered · Rodina | Regional assembly, Kaliningrad Oblast, 2006 12.03.2006 · Kaliningrad Oblast |
| Oskolkov Nikolay Ivanovich b. 13.10.1961 · Registered · Yabloko | Regional assembly, Kirov Oblast, 2006 12.03.2006 · Kirov Oblast |
| Osmanov Albert Teuchezhovich b. 1971 · Registered · A Just Russia | Regional assembly, Republic of Adygea, 2026 20.09.2026 · Republic of Adygea |
| Osmanov Akhadulla Omarovich b. 08.05.1958 · Registered · Patriots of Russia | Regional assembly, Republic of Dagestan, 2007 11.03.2007 · Republic of Dagestan |
| Osmanov Gadzhimurad Kurbangadzhievich b. 1984 · Registered · United Russia | Regional assembly, Republic of Dagestan, 2026 20.09.2026 · Republic of Dagestan |
| Osmanov Ibragim Magomedovich b. 02.07.1945 · Registered · CPRF | Regional assembly, Republic of Dagestan, 2007 11.03.2007 · Republic of Dagestan |
| Osmanov Ildar Sultanmuradovich b. 01.11.1955 · Registered · A Just Russia | Regional assembly, Republic of Dagestan, 2007 11.03.2007 · Republic of Dagestan |
| Osmanov Kamil Eldarovich b. 26.11.1949 · Registered · United Russia | Regional assembly, Republic of Dagestan, 2007 11.03.2007 · Republic of Dagestan |
| Osmanov Kurbanali Magomedbekovich b. 2004 · Registered · New People | Regional assembly, Republic of Dagestan, 2026 20.09.2026 · Republic of Dagestan |
| Osmanova Zeynab Zeynadinovna b. 20.01.1981 · Registered · A Just Russia | Regional assembly, Republic of Dagestan, 2007 11.03.2007 · Republic of Dagestan |
| Osmolovskiy Gennadiy Sergeevich b. 20.06.1939 · Registered · CPRF | Regional assembly, Smolensk Oblast, 2002 19.05.2002 · Smolensk Oblast |
| Osovskoy Andrey Nikolaevich b. 29.04.1980 · Registered · United Russia | Regional assembly, Vologda Oblast, 2007 11.03.2007 · Vologda Oblast |
| Osokin Denis Aleksandrovich b. 01.08.1983 · Registered · LDPR | Regional assembly, Moscow Oblast, 2007 11.03.2007 · Moscow Oblast |
| Ostanina Nadezhda Vladimirovna b. 1976 · Registered · United Russia | Regional assembly, Komi Republic, 2025 14.09.2025 · Komi Republic |
| Ostankov Boris Alekseevich b. 25.10.1951 · Registered · Patriots of Russia | Regional assembly, Sverdlovsk Oblast, 2006 08.10.2006 · Sverdlovsk Oblast |
| Ostapenko Aleksandr Grigorevich b. 1958 · Registered · A Just Russia | Regional assembly, Belgorod Oblast, 2025 14.09.2025 · Belgorod Oblast |
| Ostapets Aleksey Nikolaevich b. 03.03.1948 · Registered · CPRF | Regional assembly, Khabarovsk Krai, 2005 11.12.2005 · Khabarovsk Krai |
| Ostapiv Roman Mikhaylovich b. 28.03.1976 · Registered · LDPR | Regional assembly, Samara Oblast, 2007 11.03.2007 · Samara Oblast |
| Osterova Liliya Valerevna b. 12.08.1974 · Registered · CPRF | Regional assembly, Chuvash Republic, 2006 08.10.2006 · Chuvash Republic |
| Ostrovskaya Valentina Ivanovna b. 29.02.1944 · Registered · CPRF | Regional assembly, Krasnoyarsk Krai, 2007 15.04.2007 · Krasnoyarsk Krai |
| Ostrovskiy Anatoliy Bentsianovich b. 18.02.1940 · Registered · United Russia | Regional assembly, Khabarovsk Krai, 2005 11.12.2005 · Khabarovsk Krai |
| Ostrovskiy Valeriy Petrovich b. 30.01.1947 · Registered · Yabloko | Regional assembly, Saint Petersburg, 2002 08.12.2002 · Saint Petersburg |
| Ostrovskiy Stanislav Markovich b. 01.01.1947 · Registered · CPRF | Regional assembly, Republic of Dagestan, 2007 11.03.2007 · Republic of Dagestan |
| Ostropovich Natalya Vladimirovna b. 1960 · Registered · Party of Pensioners | By-election · Regional assembly, Tula Oblast, 2026 20.09.2026 · Tula Oblast |
| Ostroumov Dmitriy Yurevich b. 20.11.1975 · Registered · Rodina | Regional assembly, Sverdlovsk Oblast, 2004 14.03.2004 · Sverdlovsk Oblast |
| Ostroukhova Polina Sergeevna b. 1999 · Registered · United Russia | Regional assembly, Magadan Oblast, 2025 14.09.2025 · Magadan Oblast |
| Oskin Vasiliy Fedorovich b. 15.09.1948 · Registered · CPRF | Regional assembly, Samara Oblast, 2007 11.03.2007 · Samara Oblast |
| Oskin Viktor Fedorovich b. 12.02.1952 · Registered · CPRF | Repeat · Regional assembly, Ulyanovsk Oblast, 2004 14.03.2004 · Ulyanovsk Oblast |
| Oskina Natalya Vladimirovna b. 1974 · Registered · CPRF | By-election · Regional assembly, Rostov Oblast, 2026 20.09.2026 · Rostov Oblast |
| Oskina Natalya Vladimirovna b. 1974 · Registered · CPRF | By-election · State Duma, 2024 08.09.2024 · Russian Federation |
