Preto River or Prêto River may refer to these rivers in Brazil:

• Preto River (Amapá)

• Preto da Eva River
• Preto River (Padauari River tributary)
• Preto River (Unini River tributary)

• Preto River (Bahia, Atlantic Ocean)
• Preto River (Bahia, Grande River tributary)
• Preto River (Bahia, Jequié River tributary)

• Preto River (Cricaré River tributary)
• Preto River (Espírito Santo), Itabapoana River tributary
• Preto River (Itabapoana River tributary), west of the above
• Preto River (Itaúnas River tributary)
• Preto River (Mariricu River tributary)

• Preto River (Paracatu River tributary)
• Preto River (Paranaíba River tributary)
• Preto River (Tocantins River tributary)

• Preto River (Maranhão)

• Preto River (Araçuaí River tributary)
• Preto River (Paraibuna River tributary)

• Preto River (Paraíba)

• Preto River (Paraná)

• Preto River (Pernambuco)

• Preto River (Piabanha River tributary)
• Preto River (Ururaí River tributary)

• Preto de Candeias River
• Preto do Crespo River
• Preto River (Rondônia)

• Preto River (Roraima)

• Preto River (Negro River tributary)
• Preto River (Do Peixe River tributary)

• Preto River (São Paulo)

• Preto (disambiguation)
• Rio Preto (disambiguation)
• Río Prieto (disambiguation)