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.
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:
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.