[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.

Legal amendments introduced in 1998 allowed for these to be held together with European Parliament elections, provided that they were scheduled for within a four month-timespan.

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

Investiture processes to elect the President of the Government of Navarre required for an absolute majority—more than half the votes cast—to be obtained in the first ballot.