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 Magadan Constituency (No.116) is a Russian legislative constituency in the Magadan Oblast. The constituency is the only one in Magadan Oblast, and occupies the whole of its territory.
The Nizhny Novgorod Constituency is a Russian legislative constituency in Nizhny Novgorod Oblast.
The Sakhalin Constituency (No.167) is a Russian legislative constituency in the Sakhalin Oblast. The constituency is the only one in Sakhalin Oblast, and occupies the whole of its territory. It is also the only Russian constituency situated exclusively on islands.
The Novgorod Constituency (No.134) is a Russian legislative constituency covering the entirety of Novgorod Oblast.
The Kursk Constituency (No.109) is a Russian legislative constituency in the Kursk Oblast. In 1993-2007 the constituency covered Eastern Kursk Oblast, the cities of Kursk and Shchigry, but in 2016 Lgov constituency in Western Kursk Oblast was extended to Kursk and gained the name "Kursk constituency", while the territory of former Kursk constituency was placed into Seimsky constituency.
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 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.100) 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 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 Orenburg constituency (No.142) is a Russian legislative constituency in Orenburg Oblast. Until 2007 the constituency covered the entirety of Orenburg and central Orenburg Oblast, however, since 2016 Orenburg constituency covers only half of Orenburg and southwestern Orenburg Oblast.
The Buguruslan constituency (No.143) is a Russian legislative constituency in Orenburg Oblast. Until 2007 the constituency covered western Orenburg Oblast; however, in 2016 the constituency took parts of Orenburg and was reconfigured to northwestern Orenburg Oblast.
The Nizhny Tagil constituency (No.171) is a Russian legislative constituency in Sverdlovsk Oblast. The constituency covers central Sverdlovsk Oblast and anchors in the industrial city of Nizhny Tagil.
The Kolomna constituency (No.119) is a Russian legislative constituency in Moscow Oblast. The constituency covers southeastern Moscow Oblast.
