Javier “Javi” Martínez Aginaga (born 2 September 1988) is a Spanish footballer who plays as a defensive midfielder or central defender for Bundesliga club Bayern Munich.
He arrived at Athletic Bilbao in 2006, before his 18th birthday, quickly imposing himself as a starter and going on to appear in 251 official games over the course of six La Liga seasons, scoring 26 goals. In 2012, he signed with Bayern Munich for €40 million, going on to win eight consecutive Bundesliga titles as well as the UEFA Champions League in 2013 and 2020.
A Spain international since 2010, Martínez was a member of the squads that won the 2010 FIFA World Cup and UEFA Euro 2012, and also played at the 2014 FIFA World Cup.
On 29 August 2012, after Bayern Munich paid the buyout clause of €40 million in his contract, Martínez signed a five-year contract with the German club. He thus became the transfer record in the 50-year history of the Bundesliga. Martínez made his official debut on 2 September – the day of his 24th birthday – coming on as a 77th minute substitute for Bastian Schweinsteiger in a 6–1 home win over VfB Stuttgart. He scored his first goal for his new club against Hannover 96 on 24 November, netting the opener in an eventual 5–0 home triumph through a bicycle kick.