Jon Martín

As a youth player, Martín joined the youth academy of La Liga side Real Sociedad and was sent on loan to the youth academy of Beasain in 2022. In 2023, he was promoted to the club's C team before being promoted to their reserve team the same year. On 11 October 2023, he was named by English newspaper The Guardian as one of the best players born in 2006 worldwide. One year later, he was promoted to their senior team. On 19 May 2024, he debuted for them during a 2–0 away win over Real Betis in the league.

Martín plays as a centre-back and is right-footed. Spanish news website Onda Vasca wrote in 2025 that he "has excellent heading ability... often finishes off many set pieces... [has] refined technique for playing the ball".

Club

As of match played 20 September 2026

International

As of match played 4 June 2026

Martín was born on 23 April 2006 in Lasarte-Oria (near San Sebastián), Spain. His father Xanti Martín was also a footballer and a centre-back.