Juan Silveira dos Santos (Portuguese pronunciation: [hu'?~ si?'vej?? dus 's?~tus]; born 1 February 1979 in Rio de Janeiro), commonly known as Juan, is a Brazilian retired footballer who played as a central defender.
Having begun his career with Flamengo, he spent a decade playing in Europe in service of Bayer Leverkusen and Roma before returning to Brazil with Internacional in 2012.
Juan earned 79 caps and scored seven international goals for Brazil.