The Spanish Socialist Workers' Party (PSOE), under then-incumbent President Gabriel Urralburu, won the election for a second consecutive term, albeit with a diminished share of the vote (27.7%, losing nearly 8 percentage points from 1983) and losing 5 seats.

The Democratic and Social Centre (CDS), the party of former Spanish Prime Minister Adolfo Suárez, benefitted from this division and finished fourth, gaining 4 seats.

Meanwhile, the left-wing Herri Batasuna (HB) also improved its position from 1983 and scored one of the best results for the abertzale left in Navarre.

[1] Voting was on the basis of universal suffrage, which comprised all nationals over 18 years of age, registered in Navarre and in full enjoyment of their political rights.

The 50 members of the Parliament of Navarre were elected using the D'Hondt method and a closed list proportional representation, with a threshold of three percent of valid votes—which included blank ballots—being applied regionally.

The highest percentage figure in each polling survey is displayed with its background shaded in the leading party's colour.

The "Lead" column on the right shows the percentage-point difference between the parties with the highest percentages in a poll.

[1] As a result of the investiture process failing to provide a regional President within two months from the first ballot, Gabriel Urralburu was automatically elected on 30 September 1987 and officially sworn into office on 8 October.