Serpukhov constituency

Serpukhov single-member constituency
Constituency of the Russian State Duma
Constituency boundaries from 2016 to 2026
Deputy	Aleksandr Kogan United Russia
Federal subject	Moscow Oblast
Districts	Chekhov, Kashira, Ozyory, Protvino, Pushchino, Serpukhov, Stupino
Other territory	Kazakhstan (Nur-Sultan-3), Germany (Munich-2)
Voters	454,225 (2021)[1]

The Serpukhov constituency (No.126^[a]) is a Russian legislative constituency in Moscow Oblast. The constituency covers southern Moscow Oblast, including the cities Chekhov, Kashira, Ozyory, Protvino, Pushchino, Serpukhov and Stupino.

The constituency has been represented since 2021 by United Russia deputy Aleksandr Kogan, former two-term Member of State Duma and Minister of Ecology and Natural Resources of Moscow Oblast, who won the open seat, succeeding one-term United Russia incumbent Yury Oleynikov.

1995–2007: Chekhovsky District, Domodedovsky District, Prioksk, Protvino, Pushchino, Serpukhov, Serpukhovsky District, Stupinsky District^[2][3]
The constituency was created in 1995 from parts of Podolsk, Kolomna and Odintsovo constituencies. The constituency covered southern Moscow Oblast, including the cities Chekhov, Domodedovo, Protvino, Pushchino, Serpukhov and Stupino.

2016–2026: Chekhov, Kashira, Ozyory, Protvino, Pushchino, Serpukhov, Stupino^[4]
The constituency was re-created for the 2016 election and retained most of its former territory, losing only Domodedovo to Podolsk constituency. This seat instead gained Kashira from Kolomna constituency.

Since 2026: Bronnitsy, Chekhov, Ramenskoye (Bykovo, Ganusovskoye, Ilyinsky, Kratovo, Nikonovskoye, Ramenskoye, Rodniki, Safonovskoye, Sofyinskoye, Udelnaya, Ulyaninskoye, Vereyskoye, Vyalkovskoye, Zabolotyevskoye), Serpukhov, Stupino^[5]
After the 2025 redistricting the constituency was significantly changed, losing Kashira to Kolomna constituency. This seat instead gained a strip across central Ramenskoye and Bronnitsy from Lyubertsy constituency.