Lazio 1 is one of the 29 constituencies () represented in the Chamber of Deputies, the lower house of the Italian parliament. The constituency currently elects 39 deputies. Its boundaries correspond to those of the Metropolitan City of Rome, within the Lazio region. The electoral system uses a parallel voting system, which act as a mixed system, with 37% of seats allocated using a first-past-the-post electoral system and 61% using a proportional method, with one round of voting.
The constituency was first established by the Mattarella law on 4 August 1993 and later confirmed by the Calderoli law on 21 December 2005 and by the Rosato law on 3 November 2017.
Members of the Parliament 2018–present + Single-member districtsDistrictElectoral listDeputyParliamentary groupN.NameMapAt electionCurrent 01Rome–Trionfale Centre-left coalition Paolo GentiloniDemocratic Party Centre-left coalition Roberto GualtieriDemocratic Party Centre-left coalition Cecilia D'EliaDemocratic Party 02 Rome–Montesacro Centre-left coalition Marianna MadiaDemocratic Party 03 Rome–Castel Giubileo Centre-right coalition Annagrazia CalabriaForza Italia 04 Rome–Collatino Five Star Movement Massimiliano De Toma Five Star Movement Brothers of Italy 05 Rome–Torre Angela Five Star Movement Lorenzo Fioramonti Five Star Movement Green Italia 06 Rome–Tuscolano Five Star Movement Felice Mariani Five Star Movement League 07 Rome–Pomezia Five Star Movement Marco BellaFive Star Movement 08 Rome–Ardeatino Centre-left coalition Patrizia PrestipinoDemocratic Party 09 Rome–Fiumicino Five Star Movement Emilio Carelli Five Star Movement Together for the Future 10 Rome–Gianicolense Centre-left coalition Riccardo MagiMore Europe11Rome–Primavalle Five Star Movement Emanuela Del ReFive Star Movement Centre-left coalition Andrea CasuDemocratic Party 12 Guidonia Montecelio Five Star Movement Sebastiano CubedduFive Star Movement 13 Velletri Centre-right coalition Marco SilvestroniBrothers of Italy 14 Marino Centre-right coalition Maria SpenaForza Italia
+ Multi-member districtsDistrictPartyDeputyN.NameMap01Lazio 1 – 01 Five Star Movement Carla Ruocco Five Star Movement Massimiliano Enrico Baroni Five Star Movement Vittoria Baldino Democratic Party Luciano Nobili Democratic Party Flavia Piccoli Nardelli League Giuseppe Basini Forza Italia Andrea Ruggieri Brothers of Italy Federico Mollicone02Lazio 1 – 02 Five Star Movement Federico Daga Five Star Movement Manuel Tuzi Five Star Movement Angela Salafia Democratic Party Matteo Orfini Democratic Party Michele Anzaldi League Barbara Saltamartini Forza Italia Antonio Angelucci Brothers of Italy Maria Teresa Bellucci Free and Equal Stefano Fassina03Lazio 1 – 03 Five Star Movement Stefano Vignaroli Five Star Movement Francesca Flati Five Star Movement Francesco Silvestri Democratic Party Roberto Morassut Democratic Party Micaela Campana League Sara De Angelis Forza Italia Sestino Giacomoni Brothers of Italy Fabio Rampelli
References