13 January – 1991 Portuguese presidential election:[1] President Mário Soares (in office since 1986) is re-elected for a second term with more than 70% of the votes. He was supported by PS and PSD, the two major parties in Portugal.
6 October - 1991 Portuguese legislative election: Led by Aníbal Cavaco Silva, the incumbent centre-right PSD wins an historical absolute majority, renewing the majority they had conquered in the 1987 election. Prime Minister Cavaco Silva (in office since 1985) is appointed for a third term in office.