Marquesses | Titles by Rank
- Marquesses of Sierra-Nevada
- Marquesses of Siete Iglesias
- Marquesses of Sillery
- Marquesses of Silvela
- Marquesses of Simiane
- Marquesses of Siougeat
- Marquesses of Sligo
- Marquesses of Sobremonte
- Marquesses of Sobroso
- Marquesses of Socorro
- Marquesses of Sofraga
- Marquesses of Solanda
- Marquesses of Solera
- Marquesses of Sollerich
- Marquesses of Somerset
- Marquesses of Someruelos
- Marquesses of Somio
- Marquesses of Somosancho
- Marquesses of Sorans
- Marquesses of Soreto
- Marquesses of Sortes
- Marquesses of Sortino
- Marquesses of Sot
- Marquesses of Soto de Aller
- Marquesses of Sotomayor
- Marquesses of Soucy
- Marquesses of Soudeilles
- Marquesses of Sourches
- Marquesses of Sourdis
- Marquesses of Soure
- Marquesses of Sousa Holstein
- Marquesses of Soveral
- Marquesses of Soydos
- Marquesses of Spaccaforno
- Marquesses of Spinazzola
- Marquesses of Squilache
- Marquesses of Squillace
- Marquesses of St. Genis de Beauregard
- Marquesses of Stafford
- Marquesses of Stainville
- Marquesses of Strevi
- Marquesses of Suffolk
- Marquesses of Surgères
- Marquesses of Surville
- Marquesses of Susa
- Marquesses of Tabalosos
- Marquesses of Tablantes
- Marquesses of Talaru
- Marquesses of Talhouet-Bonamour
- Marquesses of Talhouët-Roy