Ander Barrenetxea Muguruza (born 27 December 2001), commonly known mononymously as Barrene, is a Spanish professional footballer who plays for Real Sociedad as a forward or left winger.

Born in San Sebastián, Gipuzkoa, Basque Country, Barrenetxea is a graduate of Real Sociedad's youth setup (he joined the club from Antiguoko in 2013, on the same day as Martín Zubimendi).

[5] On 22 December 2018, Barrenetxea made his professional and La Liga debut as a late substitute for Real Sociedad in a 1–0 home loss against Deportivo Alavés.

[8] Barrenetxea's rapid progression to the senior team made him the first youth product to appear at that level without already playing for the club's B-team, known as Sanse, since Antoine Griezmann did likewise in 2009.

[12] He played a part in the club's run to the 2020 Copa del Rey final, starting in the earlier rounds (contributing three goals) and coming off the bench in the quarter-final win against Real Madrid at the Estadio Santiago Bernabeu.