The 5th Legislature of the Third Portuguese Republic () ran from 13 August 1987 to 3 November 1991. The composition of the Assembly of the Republic, the legislative body of Portugal, was determined by the results of the 1987 legislative election, held on 19 July 1987.

Election The 6th Portuguese legislative election was held on 19 July 1987. In the election, the Social Democratic Party (PPD/PSD) won by a landslide with an absolute majority, the first for a single party in democracy.Official Results — National Election Commission

Party Assembly of the Republic Votes % Seats +/−PPD/PSD 2,850,784 50.22 148 +60PS 1,262,506 22.24 60 +3 CDU 689,137 12.14 31 –7PRD 278,561 4.91 7 –38CDS 251,987 4.44 5 –18 Other/blank/invalid 343,383 6.05 0 ±0 Total 5,676,358 100.00 250 ±0

Composition (1987–1991) Party Parliamentary group leaderElectedDissolution Seats % Seats % António Capucho (Faro) (1987)Fernando Correia Afonso (Lisbon) (1987–1988)Montalvão Machado (Porto) (1988–1991)14859.214859.2 Jorge Sampaio (Lisbon) (1987–1988)António Guterres (Castelo Branco) (1988–1991)6024.06726.8 Carlos Brito (Faro)2911.62911.6PRDHermínio Martinho (Santarém) (1987–1990)72.800.0 Narana Coissoró (Lisbon)41.641.6PEVMaria Amélia Santos (Setúbal) (1987–1989)Herculano Pombo (Lisbon) (1989–1990)20.800.0 IndependentHerculano Pombo (Lisbon)Valente Fernandes (Setúbal)00.020.8  Total250100.0250100.0

Changes On December 1990, the 7 MPs of the Democratic Renewal Party left the party and decided to join the Socialist Party caucus, after a split with the then party leader, Pedro Canavarro."Legislativas 91 – Parte IV" Minute 36:57, RTP, 6 October 1991. Retrieved 12 February 2025.

Also on December 1990, the two MPs from the Ecologist Party "The Greens", Herculano Pombo and Valente Fernandes, decided to dissolve the party's caucus and sit as Independents, following a rift with the Portuguese Communist Party and defending an ecological party not aligned with the Communists.

Election for President of the Assembly of the Republic To be elected, a candidate needs to reach a minimum of 126 votes. Vítor Pereira Crespo, from the Social Democratic Party, was the sole candidate and was easily elected:

Election of the President of the Assembly of the Republic 1st Ballot → 25 August 1987 Required majority → 126 out of 250 Vítor Pereira Crespo (PPD/PSD) Against Blank ballots Invalid ballots Abstentions Absentees Sources:

One year later, on October 1988, a ballot was called to elect, again, the President of the Assembly. Two candidates were on the ballot: Incumbent President Vítor Pereira Crespo, from the Social Democratic Party, and MP António Lopes Cardoso, from the Socialist Party. Vítor Crespo was easily reelected.

Election of the President of the Assembly of the Republic 1st Ballot → 20 October 1988 Required majority → 126 out of 250 Vítor Pereira Crespo (PPD/PSD) António Lopes Cardoso (PS) Blank ballots Invalid ballots Absentees Sources:

References