Lazio 1 (Chamber of Deputies constituency)

Lazio 1 is one of the 29 constituencies (Italian: circoscrizioni) represented in the Chamber of Deputies, the lower house of the Italian parliament.[2] 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.[3]

Lazio 1
Chamber of Deputies Electoral constituency
Region	Lazio
Electorate	2,890,202 (2018)[1]
Major settlements	Rome
Current constituency
Created	1993
Seats	39
Member(s)	M5S (16)   PD (9)   FI (5)   FdI (4)   Lega (3)   LeU (1)   +E (1)

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.