Viscounts | Titles by Rank
- Viscounts of São Luis de Braga
- Viscounts of São Luis do Maranhão
- Viscounts of São Mamede
- Viscounts of São Manuel
- Viscounts of São Marçal
- Viscounts of São Mateus
- Viscounts of São Miguel Ângelo
- Viscounts of São Miguel de Seide
- Viscounts of São Paio dos Arcos
- Viscounts of São Pedro do Rego da Murta
- Viscounts of São Pedro do Sul
- Viscounts of São Salvador de Campos
- Viscounts of São Salvador de Matosinhos
- Viscounts of São Salvador de Tangil
- Viscounts of São Sebastião
- Viscounts of São Sebastião
- Viscounts of São Tiago
- Viscounts of São Tiago de Lobão
- Viscounts of São Torquato
- Viscounts of São Valentim
- Viscounts of São Venâncio
- Viscounts of São Veríssimo
- Viscounts of São Vicente
- Viscounts of São Vicente da Pena de Vilar
- Viscounts of Sapucaí
- Viscounts of Sapucaí
- Viscounts of Sardoal
- Viscounts of Sarmento
- Viscounts of Sarzedo
- Viscounts of Saulieu de La Chomonerie
- Viscounts of Saulieu O'Toole
- Viscounts of Sault de Chalosse
- Viscounts of Savigny
- Viscounts of Saviñan
- Viscounts of Schmidt
- Viscounts of Seabra
- Viscounts of Sébourg
- Viscounts of Sédières
- Viscounts of Ségur
- Viscounts of Ségur-Lamoignon
- Viscounts of Seisal
- Viscounts of Semelhe
- Viscounts of Sena Fernandes
- Viscounts of Sendielos
- Viscounts of Senhora da Ribeira
- Viscounts of Sepetiba
- Viscounts of Sère
- Viscounts of Sergimirim
- Viscounts of Sérgio de Sousa
- Viscounts of Serpa Pinto