|Full name||Iñigo Larrainzar Santamaría|
|Date of birth||5 June 1971|
|Place of birth||Pamplona, Spain|
|Height||1.73 m (5 ft 8 in)|
|Playing position||Right back|
|* Senior club appearances and goals counted for the domestic league only.
A product of hometown CA Osasuna's youth ranks and reserve team, where he played alongside future Athletic Bilbao teammate José Mari García, Larrainzar made his first-team – and La Liga – debut on 21 March 1990 in a 0–1 away loss against Rayo Vallecano, and was definitely promoted to the main squad for the following season: aged 19, he was instrumental, as was brother Domingo, in helping the Navarrese side finish fourth and qualify for the UEFA Cup.
In the 1993 summer, Athletic Bilbao paid 200 million pesetas to acquire Larrainzar's services, then the second-highest figure by the club, and he was an undisputed starter in the campaigns to come. In 1997–98, alongside youth graduate Aitor Larrazábal who played on the opposite flank, he featured in 34 matches and scored two goals to help the Basques to a runner-up place, with direct qualification to the UEFA Champions League.
After some years battling for first-choice status with younger Jesús María Lacruz, who also represented Osasuna (although they did not coincide), and also dealing with injuries, Larraínzar moved south for Córdoba CF in the second division, where he played a further two seasons. He retired at the age of 34, with 366 top level appearances to his credit.
- César Azpilicueta supera a Iñigo Larrainzar al llegar a los 100 partidos con sólo 20 años y 9 meses de edad (César Azpilicueta passes Iñigo Larrainzar by reaching 100 games at only 20 years and 9 months); Diario de Navarra, 6 April 2010 (in Spanish)
- Aquella UEFA de hace 20 años (That UEFA from 20 years ago); Diario de Navarra, 4 October 2011 (in Spanish)
- Larrainzar: "No he venido aquí para cubrir expediente y pasar de largo" (Larrainzar: "I did not come here to sow my wild oats); Diario de Córdoba, 11 February 2004 (in Spanish)
- "España, de cal y arena" [Spain, heads and tails] (PDF) (in Spanish). Mundo Deportivo. 20 January 1994. Retrieved 3 February 2016.