Oier Unamuno is a professional footballer from ESP and is currently 19 years old. He is on the books of Athletic Bilbao U19 and wears shirt number 2. His main role on the pitch is Defender.

His latest transfer saw him join Athletic Bilbao U19 from Athletic Bilbao U18 via on 2024-07-01.

Across the UEFA Youth League 2025-2026, Oier Unamuno appeared in 6 matches and averaged 1.7 tackles, 0.3 interceptions, 1.5 clearances, and 0.2 blocked shots per game.