An election of MEP representing Portugal constituency for the 1989-1994 term of the European Parliament was held on 18 June 1989.

The Social Democratic Party (PSD) won the elections with almost 33 percent of the votes, but lost much ground compared with 1987.

Although the country was experiencing a significant economic growth at that time, the PSD saw the gap between them and the Socialists narrow to around 4 percentage points.

The Democratic Unity Coalition (CDU), also performed very well, winning 14 percent and becoming the third political force.

The CDS saw its share of vote drop a bit, to also 14 percent and was surpassed by CDU, as it fell to fourth place.