Jhon Cristofer Valladares Contreras (born 24 March 1980), frequently named John Valladares, is a Chilean football manager and former player who played as a centre-back. He is the current interim manager of Universidad de Chile.
A product of Universidad de Chile, Valladares was a member of the squad that won the league title in 2000. He developed his entire career in his homeland, playing also for Deportes La Serena, Unión San Felipe, Audax Italiano, Deportes Melipilla, San Luis, Santiago Wanderers and Coquimbo Unido.
At international level, he represented the Chile national under-17 team in the 1997 South American Championship.
As a football manager, he began his career at the Santiago Wanderers youth ranks. In 2022, he assumed as the interim coach of the first team.
In 2024, he joined the Universidad de Chile youth system as coach of the under-18's.
He is the father of the football winger of a similar name, John Valladares, who made his professional debut under his father with Santiago Wanderers in 2022.