Xiker Ozerinjauregi Mendikoetxea (born 30 January 1997), known as Xiker, is a Spanish professional footballer who plays as a central defender for Tercera División side Real Betis B. Xiker began his footballing career in 2007 when he joined the academy of Athletic Bilbao.
He progressed through the club's youth and reserve sides over the course of the next nine years before being halted by a serious injury.
Following his recovery he spent a season each at Segunda División B clubs Toledo and Peña Sport before joining Real Sociedad B in 2018.
The following year, he signed for Cornellà before signing for Betis six months later.
Xiker is also a former Spanish youth international and represented Spain at various youth levels between 2013 and 2015.