There are several rivers named São João River in Brazil:
São João River (Canoas River tributary), Santa Catarina state São João River (Cubatão River tributary), Paraná state São João River (Iguazu River tributary), Paraná state São João River (Ji-Paraná River tributary), Rondônia state São João River (Mato Grosso do Sul), Mato Grosso do Sul state São João River (Mato Grosso), Mato Grosso state São João River (Minas Gerais), Minas Gerais state São João River (Negro River tributary), Santa Catarina state São João River (Paraná River tributary), Paraná state São João River (Dos Patos River tributary), Paraná state São João River (Pernambuco) São João River (Pitangui River tributary), Paraná state São João River (Rio de Janeiro), Rio de Janeiro state São João River (Verde River tributary), Rondônia state Igarapé São João São João da Barra River, Mato Grosso state São João de Meriti River, Rio de Janeiro state São João do Paraíso River, Minas Gerais state São João Grande River, Espírito Santo state São João Pequeno River, Espírito Santo state São João Surrá River, Paraná state