Oier Zarraga Egaña (born 4 January 1999) is a Spanish professional footballer who plays as a central midfielder for Italian club Udinese Calcio.

Born in Getxo, Biscay, Basque Country, Zarraga joined Athletic Bilbao's youth setup in 2009, from hometown side Romo FC.

Zarraga made his debut with the reserves on 3 February 2019, coming on as a second-half substitute for Gaizka Larrazabal in a 2–1 Segunda División B home win against SD Leioa.

Definitely promoted to the B-side in June 2019,[3] he subsequently became a regular starter for the team, playing in all matches of the 2019–20 campaign before the season was curtailed due to the COVID-19 pandemic.

[7] On 29 June 2023, Zarraga moved abroad for the first time in his career, signing a four-year contract with Serie A side Udinese Calcio.