Barons | Titles by Rank
- Barons of Serra Branca
- Barons of Serra da Estrela
- Barons of Serra Negra
- Barons of Serro
- Barons of Serro Alegre
- Barons of Serro Azul
- Barons of Serro Largo
- Barons of Sertório
- Barons of Servières
- Barons of Sete Lagoas
- Barons of Setúbal
- Barons of Séverac
- Barons of Seyffertitz
- Barons of Sickingen
- Barons of Sickingen zu Hohenburg
- Barons of Sierstorpff
- Barons of Sierstorpff-Cramm
- Barons of Silva
- Barons of Silva
- Barons of Silva Gameiro
- Barons of Silva Nunes
- Barons of Silveira
- Barons of Silveiras
- Barons of Silveiras
- Barons of Simão Dias
- Barons of Sincorá
- Barons of Sinimbu
- Barons of Sintra-b
- Barons of Sinzendorf
- Barons of Sinzendorf-Ernstbrunn
- Barons of Sirignano
- Barons of Sirinhaém
- Barons of Skal
- Barons of Skal und Gross-Ellguth
- Barons of Skellater
- Barons of Smeth van Alphen
- Barons of Smeth van Deurne
- Barons of Sobral
- Barons of Sobral-br
- Barons of Socorro
- Barons of Socorro
- Barons of Soden
- Barons of Solar de Espinosa
- Barons of Soledade
- Barons of Soledade-I
- Barons of Solemacher
- Barons of Solemacher-Antweiler
- Barons of Solimões
- Barons of Sombreff
- Barons of Sommerau