Unai Bustinza Martínez (born 2 February 1992) is a Spanish professional footballer who plays as a right-back.

[6] Later that month, he played the full 90 minutes in the final of the Copa del Rey against FC Barcelona, a 3–1 loss.

[8][9] The following 18 July, having contributed 1,134 minutes in all competitions to a top-flight promotion, he signed a permanent three-year contract after cutting ties with Athletic.

[10][11] Bustinza scored the first of two goals in the Spanish top tier on 21 February 2018, but in a 1–3 home defeat to Real Madrid.

[17] Bustinza made his debut for the unofficial Basque Country national team in May 2019, in a 0–0 draw away to Panama for which a small, youthful and inexperienced squad was selected.