The new Italian electoral law approved in 2017 and nicknamed Rosatellum, provides the election of members of Parliament in 232 single-member districts for the Chamber of Deputies and in 116 for the Senate of the Republic.
The by-election in the constituency of Trionfale (Rome) was held on 1 March 2020 to elect a deputy for the seat left vacant by Paolo Gentiloni (PD).
[6] The by-election in the constituency of San Carlo all'Arena (Naples) was held on 23 February to elect a senator for the seat left vacant by Franco Ortolani (M5S), who died on 23 November 2019.
[15][16] A by-election in the constituency of Sassari was held on 20–21 September 2020, to elect a senator for the seat left vacant by Vittoria Bogo Deledda (M5S), who died on 17 March 2020.
[20] A by-election in the constituency of Villafranca di Verona was held in 20–21 September 2020, to elect a senator for the seat left vacant by Stefano Bertacco (FdI), who died on 14 June.