Oier Unamuno is a 19-year-old professional football player from ESP. He currently plays for Athletic Bilbao U19, wearing the number 2 shirt. He plays primarily as a Defender.

His most recent move was a from Athletic Bilbao U18 to Athletic Bilbao U19 on 2024-06-30.

Throughout the UEFA Youth League 2025-2026, Oier Unamuno featured in 6 matches, averaging 1.7 tackles, 0.3 interceptions, and 1.5 clearances per game, while blocking 0.2 shots per game.