Jefferson Cardoso dos Santos (15 February 1986 in São Vicente, Brazil) is a Brazilian football player. He plays for F.C. Red Bull Salzburg in the Austrian Bundesliga. He is a defender.
He started playing football with his local club São Vicente Atlético Clube and then went on to Jabaquara Atlético Clube in Brazils 4th league. He became Champion with this team and then went on to Red Bull Brasil. With this team he was two times promoted. In summer 2011 he and his team mate Alex Rafael were invited to train with F.C. Red Bull Salzburg. He played two test matches for Salzburg (Bayer 04 Leverkusen, Olympique Lyon). He convinced the club and so he was signed for Red Bull Salzburg. After some matches as substitution he played his first match in the starting team on 21 August 2011 in a league match versus S.K. Sturm Graz.