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

The constituency currently elects 19 of the 230 members of the Assembly of the Republic using the closed party-list proportional representation electoral system.

Setúbal currently elects 19 of the 230 members of the Assembly of the Republic using the closed party-list proportional representation electoral system.

Results of the 2011 legislative election held on 5 June 2011:[16] The following candidates were elected:[17] Mariana Aiveca (BE); Maria Luís Albuquerque (PSD); Heloísa Apolónia (CDU); Maria das Mercês Borges (PSD); Eduardo Cabrita (PS); Duarte Cordeiro (PS); Bruno Dias (CDU); Francisco Lopes (CDU); Nuno Magalhães (CDS-PP); Ana Catarina Mendonça Mendes (PS); Eurídice Pereira (PS); Pedro do ó Ramos (PSD); Paulo Simões Ribeiro (PSD); Paula Santos (CDU); Vieira da Silva (PS); João Paulo Viegas (CDS-PP); and Bruno Vitorino (PSD).

Results of the 1991 legislative election held on 6 October 1991:[28] The following candidates were elected:[29] António Alves (PSD); Ana Maria Bettencourt (PS); Rogério Brito (CDU); Mata Cáceres (PS); Torres Couto (PS); Cardoso Ferreira (PSD); Joel Hasse Ferreira (PS); Eduardo Gomes (PSD); José Manuel Maia (CDU); André Martins (CDU); Eduardo Pereira (PS); Margarida Silva Pereira (PSD); Carlos Pimenta (PSD); Couto dos Santos (PSD); Odete Santos (CDU); and Octávio Teixeira (CDU).