Fermín López Marín (born 11 May 2003) is a Spanish professional footballer who plays as a midfielder for La Liga club Barcelona and the Spain national team.

On 19 August 2022, López signed a professional contract with Barcelona Atlètic for two years until 2024, and immediately went on loan with Linares Deportivo in the Primera Federación for the 2022–23 season.

He received international recognition after a strong performance for Barcelona, as he scored a goal and provided an assist in a friendly 3–0 win over their rivals Real Madrid on 29 July 2023.

[10] López would later return to the first team setup and made his UEFA Champions League debut on 19 September, coming off the bench to replace Gavi in the 58th minute of a 5–0 home victory over Royal Antwerp in the competition's group stage.

[12] On 25 October 2023, López scored a goal on his first start in the Champions League in a 2–1 victory over Shakhtar Donetsk,[13] in which he was also named player of the match.

López along with his teammate Álex Baena became only the second and third players ever to win the UEFA European Championship and the Summer Olympic gold medal in the same year, after the French goalkeeper Albert Rust.