Julen Guerrero López (born January 7, 1974 in Portugalete, Vizcaya) is a Basque football player who has played for Athletic Bilbao since 1992.

When he was 18, he won the Spanish League and Cup for players under 19 with the Athletic Bilbao junior team. Jupp Heynckes relied on him to play for the senior team in 1992, and Julen became the "Lezama's pearl". He had the opportunity to sign up with Real Madrid, FC Barcelona or Italian clubs, but decided to stay in the Basque Country with his friends, his people and his loved club, wearing the number '8'.

Guerroro played for Spain in the 1994 and 1998 World Cups.