2025 Kostroma Oblast legislative election
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All 35 seats in the Oblast Duma 18 seats needed for a majority | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Turnout | 39.72% 7.75 pp | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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The 2025 Kostroma Oblast Duma election took place on 12–14 September 2025, on common election day, coinciding with 2025 Kostroma Oblast gubernatorial election. All 35 seats in the Oblast Duma were up for re-election.
United Russia increased its already overwhelming majority in the Legislative Assembly, winning 50.3% of the vote and 21 of 25 single-mandate constituencies. Liberal Democratic Party of Russia came in second, doubling its faction to two deputies. Communist Party of the Russian Federation and A Just Russia – For Truth saw their vote share decreasing by roughly a third, however, CPRF retained its two-member faction, while SR–ZP even gained one more seat in a single-member constituency.
Under current election laws, the Oblast Duma is elected for a term of five years, with parallel voting. 10 seats are elected by party-list proportional representation with a 5% electoral threshold, with the other half elected in 25 single-member constituencies by first-past-the-post voting. Seats in the proportional part are allocated using the Imperiali quota, modified to ensure that every party list, which passes the threshold, receives at least one mandate.[1]
Candidates
Party lists
To register regional lists of candidates, parties need to collect 0.5% of signatures of all registered voters in Kostroma Oblast.
The following parties were relieved from the necessity to collect signatures:[2]
- United Russia
- Communist Party of the Russian Federation
- Liberal Democratic Party of Russia
- A Just Russia — Patriots — For Truth
- New People
- Russian Party of Pensioners for Social Justice
- Communists of Russia
| № | Party | Territorial groups leaders | Candidates | Territorial groups | Status | |
|---|---|---|---|---|---|---|
| 1 | United Russia | Nikolay Kopytov • Svetlana Kirillova • Aleksey Anokhin • Mikhail Dushin • Vladimir Unguryan | 25 | 5 | Registered | |
| 2 | Liberal Democratic Party | Vyacheslav Matokhin • Irina Ponomareva • Yury Mindolin • Natalya Kalembrik • Ruslan Fedorov | 20 | 5 | Registered | |
| 3 | Communists of Russia | Ilya Kleymyonov • Sergey Malinkovich • |
22 | 5 | Registered | |
| 4 | Communist Party | Aleksandr Kiselev • Sergey Shpotin • Olga Panova • Sergey Rassechkin • Valery Izhitsky | 21 | 5 | Registered | |
| 5 | New People | Pavel Zayfidi • Maria Bazhenova • Aleksandr Vlas • Igor Prudnikov • Ivan Kucheryavy | 25 | 5 | Registered | |
| 6 | Party of Pensioners | Anton Gromov • Sergey Kamilatov • Yury Kudryavtsev • Dmitry Shestakov • Yury Shestakov | 22 | 5 | Registered | |
| 7 | A Just Russia – For Truth | Alexey Chepa • Daniil Potekhin • Olga Zinovyeva • Nikolay Tsvil • Vyacheslav Golovnikov | 22 | 5 | Registered | |
| Party of Social Protection | Maksim Postnikov • Vladimir Mikhaylov • Yelena Gribova • Valery Pleshevich • Viktor Perov | 20 | 5 | Failed to qualify | ||
| Rodina | Dmitry Serov • Vladislav Rozov • Yury Sharanov • Vladimir Kukharenko • Yelena Savitskaya | 15 | 5 | Did not file | ||
Yabloko, which participated in the last election, did not file, while For Truth has been dissolved since.
Party of Social Protection, led by Kostroma Oblast Duma member and businessman Vladimir Mikhaylov, was initially denied document filing by the Electoral Commission of Kostroma Oblast due to irregularities at the party conference.[3] The party was able to hold another conference and file the documents again four days later,[4] however, this time the party failed to qualify after the electoral commission ruled the party had United Russia members as conference participants.[5] On August 5 Kostroma Oblast Court ruled in favour of the party and obliged the electoral commission to register Party of Social Protection list[6] but party candidates in single-mandate constituencies were not reinstated.[7] On September 9, First Appellate Court overturned the Kostroma Oblast Court's ruling on party reinstatement[8] and the same day Kostroma Oblast Court ordered to remove Party of Social Protection from the ballot.[9] During the 2020 election the party was also removed from the ballot after initial registration.
Single-mandate constituencies
25 single-mandate constituencies were formed in Kostroma Oblast. To register candidates in single-mandate constituencies need to collect 3% of signatures of registered voters in the constituency.[1]
| Party | Candidates | ||
|---|---|---|---|
| Nominated | Registered | ||
| United Russia | 25 | 24 | |
| Communist Party | 25 | 24 | |
| Liberal Democratic Party | 24 | 24 | |
| A Just Russia – For Truth | 21 | 20 | |
| Party of Pensioners | 19 | 19 | |
| New People | 22 | 21 | |
| Rodina | 1 | 0 | |
| Party of Social Protection | 2 | 0 | |
| Total | 139 | 132 | |
Polls
| Fieldwork date | Polling firm | UR | LDPR | CPRF | RPPSS | NL | SR-ZP | CPCR |
|---|---|---|---|---|---|---|---|---|
| 14 September 2025 | 2025 election | 50.3 | 12.1 | 11.3 | 7.3 | 6.8 | 6.1 | 3.6 |
| 23–24 August 2025 | Russian Field | 44.2 | 16.0 | 15.2 | 7.5 | 8.4 | 6.3 | 1.2 |
| 13 September 2020 | 2020 election | 31.9 | 12.1 | 17.2 | 8.3 | 7.5 | 9.2 | 3.0 |
