The 6th Legislature of the Third Portuguese Republic () ran from 4 November 1991 to 26 October 1995. This legislature saw a reduction in the total number of elected MPs, from 250 to 230, following a constitutional review in 1989. The composition of the Assembly of the Republic, the legislative body of Portugal, was determined by the results of the 1991 legislative election, held on 6 October 1991. 
Election.
The 7th Portuguese legislative election was held on 6 October 1991. In the election, the Social Democratic Party (PPD/PSD) won for the third consecutive time and renewed the absolute majority achieved four years earlier.
Election for President of the Assembly of the Republic.
To be elected, a candidate needs to reach a minimum of 116 votes. Two ballots were needed to elected a new President. António Barbosa de Melo, from the Social Democratic Party, faced MP , from the Socialist Party, in both rounds. On the second round, Barbosa de Melo was elected by a narrow majority: