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 Nizhny Novgorod Constituency is a Russian legislative constituency in Nizhny Novgorod Oblast.
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 Serov Constituency (No.174) is a Russian legislative constituency in Sverdlovsk Oblast. The constituency covers northern Sverdlovsk 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 Avtozavodsky constituency (No.131) is a Russian legislative constituency in Nizhny Novgorod Oblast. Until 2007 the constituency covered Avtozavodsky, Leninsky and Sovetsky City Districts of Nizhny Novgorod. In 2016 Avtozavodsky constituency only retained Avtozavodsky City District but it took Pavlovo from former Dzerzhinsk constituency and Vyksa from former Arzamas constituency.
The Kanavinsky constituency (No.132) is a Russian legislative constituency in Nizhny Novgorod Oblast. Until 2007 the constituency covered Kanavinsky, Moskovsky, Nizhegorodsky and Sormovsky City Districts of Nizhny Novgorod. In 2016 Kanavinsky constituency was stretched to the west to take parts of the dismantled Dzerzhinsk constituency.
The Bor constituency (No.133) is a Russian legislative constituency in Nizhny Novgorod Oblast. It covers northern Nizhny Novgorod Oblast.
The Dzerzhinsk constituency (No.119) was a Russian legislative constituency in the Nizhny Novgorod Oblast in 1993–2007. The constituency covered western Nizhny Novgorod Oblast, including Dzerzhinsk and Pavlovo. In 2016 Nizhny Novgorod Oblast lost one of its constituencies and Dzerzhinsk constituency was partitioned between Avtozavodsky and Kanavinsky constituencies.
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 Smolensk constituency (No.175) is a Russian legislative constituency in Smolensk Oblast. Until 2007 the constituency covered the entirety of Smolensk and western Smolensk Oblast, however, since 2016 Smolensk constituency includes only parts of Smolensk but also it was redistricted to northern Smolensk Oblast, taking more territory from eliminated Vyazma 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 Sverdlovsk constituency (No.168) is a Russian legislative constituency in Sverdlovsk Oblast. Until 2007 the constituency covered western half of Yekaterinburg, however, after 2015 redistricting the constituency was expanded to Yekaterinburg satellite cities of Verkhnyaya Pyshma and Sredneuralsk.
The Kamensk-Uralsky constituency (No.169) is a Russian legislative constituency in Sverdlovsk Oblast. The constituency covers southeastern corner of Sverdlovsk Oblast. Until 2007 the constituency covered Yekaterinburg's suburbs and exurbs, however after 2015 redistricting it shedded its northern part to Beryozovsky and Asbest constituency, while taking Chkalovsky District of Yekaterinburg from Verkh-Isetsky constituency.
The Pervouralsk constituency (No.173) is a Russian legislative constituency in Sverdlovsk Oblast. The constituency covers southewestern Sverdlovsk Oblast.
The Asbest constituency is a Russian legislative constituency in Sverdlovsk Oblast. Until 2007 Artyomovsky constituency covered most of eastern Sverdlovsk Oblast. However, after 2015 redistricting the constituency was significantly altered with most of former Artyomovsky constituency placed into new Asbest constituency, which now stretches from central Yekaterinburg eastwards to the border with Tyumen Oblast.
The Beryozovsky constituency (No.170) is a Russian legislative constituency in Sverdlovsk Oblast. Until 2007 the constituency was based entirely in Yekaterinburg, however, after 2015 redistricting the constituency was stretched to central Sverdlovsk Oblast.
The Zlatoust constituency (No.193) is a Russian legislative constituency in Chelyabinsk Oblast. The constituency covers historical Mountain-Industrial Zone in northwestern Chelyabinsk Oblast.
The Kolomna constituency (No.119) is a Russian legislative constituency in Moscow Oblast. The constituency covers southeastern Moscow Oblast.
