Juan Silveira dos Santos

Football player infobox |

 playername = Juan |
 image = Juan |
 fullname = Juan Silveira dos Santos|
 height = 1.82 m |
 nickname = |
 dateofbirth = February 1, 1979 |
 cityofbirth = Rio de Janeiro |
 countryofbirth = Brazil |
 currentclub  = Bayer Leverkusen |
 clubnumber = 4 |
 position = Defender |
 youthyears =  |
 youthclubs = Flamengo |
 years = 1996-2002
 2002-present |
 clubs = Flamengo
 Bayer Leverkusen |
 caps(goals) = 245 (29)
134 (11) |
 nationalyears = 2002-present |
 nationalteam = Brazil |
 nationalcaps(goals) = 53 (1) |
 pcupdate = June 15, 2006 |
 ntupdate = June 15, 2006

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Juan Silveira dos Santos (biasa dipanggil Juan; lahir 1 Februari 1979 di Rio de Janeiro) adalah pemain belakang tim nasional sepak bola Brasil yang bertinggi badan 182 cm. Ia bermain di Bundesliga untuk klub Bayer Leverkusen. Sebelum ke Jermany pada 2002, ia bermain di klub Clube de Regatas do Flamengo.