Jonás Ramalho Chimeno (born 10 June 1993) is a professional footballer who plays as a central defender for Kuwaiti club Kazma.

[3] A product of Athletic Bilbao's famed youth system at Lezama, he first appeared with the main squad at only 14, featuring as a substitute in a friendly match against SD Amorebieta to become its youngest player of all time.

[5] Ramalho made his La Liga debut on 20 November 2011 at the age of 18 years and five months, sent on by coach Marcelo Bielsa to play the last five minutes in place of Fernando Llorente a 2–1 away win against Sevilla FC.

[6] On 2 August of the following year he made his first appearance in European competition, starting in a 3–1 home victory over NK Slaven Belupo in that season's UEFA Europa League.

[18] Ramalho was called up by Angola manager Srđan Vasiljević in a preliminary squad for the 2019 Africa Cup of Nations,[19] but was one of three players cut before the final tournament in Egypt.