Inaxio Kortabarria Abarrategi (born 31 July 1950) is a Spanish former footballer who played as a central defender.

From there onwards, Kortabarria rarely missed a game, contributing 30 and 31 matches respectively as the Basques won back-to-back leagues (whilst adding five and six goals, his career-bests) with him as captain.

[2][3] After losing his place to younger Agustín Gajate, Alberto Górriz and Juan Antonio Larrañaga, all brought up in the club's youth academy, Kortabarria chose to retire at the end of 1984–85 aged 35.

His debut came on 22 May 1976, in a 2–0 loss in West Germany for the UEFA Euro 1976's qualifying stages.

[4] On 5 December 1976, before a game against Athletic Bilbao, Kortabarria and the opposing captain, José Ángel Iribar, carried out the Ikurriña, the Basque flag, and placed it ceremonially on the centre-circle.