By-elections to the 7th Russian State Duma were held to fill vacancies in the State Duma between the 2016 election and the 2021 election.
The Chukotka constituency is a Russian legislative constituency in the Chukotka Autonomous Okrug. The constituency is the only one in Chukotka, and occupies the whole of its territory. It is also the smallest single-member constituency of the State Duma by population.
The Yakutsk Constituency (No.24) is a Russian legislative constituency in the Sakha Republic (Yakutia). The constituency is the only one in Sakha Republic, and occupies the whole of its territory. Yakutsk Constituency is also the largest single-mandate territorial constituency in the world.
The Engels single-member constituency is a Russian legislative constituency in the Saratov Oblast. The constituency covers southern and southeastern parts of Saratov Oblast and is anchored in the city of Engels.
The Syktyvkar Constituency (No.18) is a Russian legislative constituency in the Komi Republic. The constituency is the only one in Komi Republic, and occupies the whole of its territory. However, in 1993-1995 Komi had two constituencies but lost one of them due to population decline.
The Dauria Constituency (No.44) is a Russian legislative constituency in Zabaykalsky Krai. In 1993-2007 the constituency was based in South-Eastern Chita Oblast. In 2008 Chita Oblast merged with Agin-Buryat Autonomous Okrug to form Zabaykalsky Krai, and newly-configured Dauria constituency now covers western half of Chita, Southern Zabaykalsky Krai, as well as territory of the former Agin-Buryat Autonomous Okrug.
The Amur Constituency is a Russian legislative constituency covering the entirety of Amur Oblast.
The Tver Constituency (No.179) is a Russian legislative constituency in the Tver Oblast. In 1993-2007 the constituency covered Western Tver Oblast, including the city of Tver, but in 2016 Bezhetsk constituency in Eastern Tver Oblast was extended to Tver and gained the name "Tver constituency", while the territory of former Tver constituency was placed into Zavolzhsky constituency.
The Bezhetsk Constituency (No.172) was a Russian legislative constituency in the Tver Oblast in 1993-2007. The constituency covered upstate Northern and Eastern Tver Oblast. Since 2016 most of the constituency was placed into Tver constituency.
The Ivanovo constituency (No.91) is a Russian legislative constituency in Ivanovo Oblast. Until 2007 the constituency covered only the city of Ivanovo and western corner of Ivanovo Oblast, however, since 2016 the constituency covers southern half of Ivanovo as well as southern Ivanovo Oblast.
The Prioksky constituency is a Russian legislative constituency in Nizhny Novgorod Oblast. Until 2007 it covered southwestern Nizhny Novgorod Oblast, including Arzamas, Sarov and Vyksa. In 2016 most of former Arzamassky constituency was placed into Prioksky constituency, which was stretched to the Prioksky District of Nizhny Novgorod, however, the constituency lost its western part.
The Tambov constituency (No.177) is a Russian legislative constituency in Tambov Oblast. Until 2007 the constituency covered the entirety of Tambov and eastern Tambov Oblast, including the cities of Kirsanov, Kotovsk and Rasskazovo. Since 2016 the constituency covered half of Tambov and northwestern part of the region, shedding most of its territory in the east to the new Rasskazovo constituency, while taking a large portion of former Michurinsk constituency.
The Kaluga constituency (No.99) is a Russian legislative constituency in Kaluga Oblast. Until 2007 the constituency covered the entirety of Kaluga and was based in eastern Kaluga Oblast. However, in 2016 the constituency changed significantly as it switched near all of its territory with Obninsk constituency, so currently Kaluga constituency is based in western Kaluga Oblast.
The Obninsk constituency (No.99) is a Russian legislative constituency in Kaluga Oblast. Until 2007 the constituency covered western Kaluga Oblast. However, in 2016 the constituency changed significantly as it switched near all of its territory with Kaluga constituency, so currently Obninsk constituency is based in eastern Kaluga Oblast.
The Kirov-Chepetsk constituency (No.106) is a Russian legislative constituency in Kirov Oblast. The constituency covers parts of Kirov and southern Kirov Oblast.
The Ulyanovsk constituency (No.187) is a Russian legislative constituency in Ulyanovsk Oblast. In 1995-2007 the constituency covered the entirety of Ulyanovsk and its suburbs, however, in 2016 the constituency shedded some district of Ulyanovsk to rural Radishchevo constituency in exchange for eastern Ulyanovsk Oblast, including Dimitrovgrad.
The Radishchevo constituency (No.188) is a Russian legislative constituency in Ulyanovsk Oblast. In 1995-2007 the constituency covered upstate Ulyanovsk Oblast, however, in 2016 the constituency took parts of Ulyanovsk from Ulyanovsk constituency.
The Tula constituency (No.183) is a Russian legislative constituency in Tula Oblast. Until 2007 the constituency was based entirely in metropolitan Tula. In 2016 Tula Oblast lost one of its three constituencies, which resulted in Tula constituency taking nearly all of former Shchyokino constituency while shedding half of Tula to Novomoskovsk constituency.
The Orsk constituency (No.144) is a Russian legislative constituency in Orenburg Oblast. The constituency covers eastern Orenburg Oblast.
The Balashikha constituency (No.117) is a Russian legislative constituency in Moscow Oblast. The constituency covers northeastern suburbs of Moscow.
