José Antonio Martínez Álvarez (born 29 July 1997), commonly known as Josín, is a Spanish footballer who plays for Avilés Industrial as a central defender.

Born in Oviedo, Asturias, Josín was a Real Oviedo youth graduate. He made his senior debut with the reserves on 10 May 2015, aged only 17, starting in a 1–0 away win against Atlético de Lugones SD in the Tercera División.

Despite being still registered with the Juvenil squad, Josín was called up to the first team for a Segunda División match against UE Llagostera on 6 May 2016.^[1] He only made his professional debut on 4 June, coming on as a second-half substitute for Josete in a 0–5 away loss against CA Osasuna; he was also sent off after one minute on the field after conceding a penalty.^[2]

Josín scored his first senior goal on 17 September 2016, netting the game's only in a home success over CD Tineo.

• Josín at BDFutbol
• Josín at LaPreferente.com (in Spanish)
• Josín at Soccerway