By-elections to the 7th Moscow City Duma are held to fill vacancies in the Russian regional parliament between the 2019 election and the . According to article 82 of the Moscow Electoral Code, by-elections are appointed by the Moscow Electoral Commission. By-elections are not appointed and are not held if, as a result of these elections, a Deputy cannot be elected for a term of more than one year before the end of the constitutional term for which the Moscow City Duma was elected. The Federal Law establishes the second Sunday of September (single voting day) as the date for any regional election, including by-elections.