Leiria is one of the 22 multi-member constituencies of the Assembly of the Republic, the national legislature of Portugal.

The constituency currently elects ten of the 230 members of the Assembly of the Republic using the closed party-list proportional representation electoral system.

Leiria currently elects ten of the 230 members of the Assembly of the Republic using the closed party-list proportional representation electoral system.

Results of the 1983 legislative election held on 25 April 1983:[34] The following candidates were elected:[35] Miguel Anacoreta Correia (CDS); Fernando Costa (PSD); Vítor Crespo (PSD); João Eliseu (PS); Leonel Fadigas (PS); Francisco Menezes Falcão (CDS); Reinaldo Gomes (PSD); Almerindo Marques (PS); Silva Marques (PSD); Hermínio Oliveira (PS); and Joaquim Gomes dos Santos (APU).

Results of the 1976 legislative election held on 25 April 1976:[40] The following candidates were elected:[41] Fernando Costa (PPD); Rodolfo Crespo (PS); Francisco de Oliveira Dias (CDS); Vasco da Gama Fernandes (PS); João Manuel Ferreira (PPD); José Júnior (PPD); Telmo Neto (PS); Rui Pena (CDS); Walter Rosa (PS); Joaquim Gomes dos Santos (PCP); and Gonçalves Sapinho (PPD).