Jonás Ramalho Chimeno (born 10 June 1993) is a Spanish professional footballer who plays as a central defender.
He was the first mixed-race player to play for Athletic Bilbao – who only field Basque players – in an official competition.
Ramalho was born in Barakaldo, Biscay, to a Basque mother and an Angolan father. 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. As a senior, he had only played once for the reserves when he received his first call-up for the first team, being named in the 18-man list for a UEFA Europa League match at home to SV Werder Bremen, filling in for regular Andoni Iraola as the side was already qualified; however, he did not leave the bench in the 0–3 group stage home loss, on 16 December 2009.