The 4th Legislature of the Third Portuguese Republic () ran from 4 November 1985 to 12 August 1987. The composition of the Assembly of the Republic, the legislative body of Portugal, was determined by the results of the 1985 legislative election, held on 6 October 1985.
In April 1987, Aníbal Cavaco Silva's government was defeated by a motion of no confidence in Parliament and the government fell. The opposition parties, the Socialist Party (PS), the Democratic Renewal Party (PRD) and the United People Alliance (APU), proposed an alternative government between them, to avoid elections, but this was rejected by President Mário Soares, who decided to dissolve the Assembly and call an election for 19 July 1987.
Election.
The 5th Portuguese legislative election was held on 6 October 1985. In the election, the Social Democratic Party (PPD/PSD) won the most seats and formed a minority government.
Election for President of the Assembly of the Republic.
To be elected, a candidate needs to reach a minimum of 126 votes. There were two candidates on the ballot: Incumbent President Fernando Monteiro do Amaral, from the Social Democratic Party, and former President of the Assembly Manuel Tito de Morais, from the Socialist Party. Monteiro do Amaral was easily reelected. 
One year later, on 28 October 1986, another ballot was called to elect, again, the President of the Assembly. Only incumbent President Fernando Monteiro do Amaral, from the Social Democratic Party, was on the ballot and he was reelected as President: