Marquesses | Titles by Rank
- Marquesses of San Juan de Buenavista
- Marquesses of San Juan de Carballo
- Marquesses of San Juan de Piedras Albas
- Marquesses of San Leonardo
- Marquesses of San Lorenzo
- Marquesses of San Luis
- Marquesses of San Mamés
- Marquesses of San Martín
- Marquesses of San Martín de Hombreiro
- Marquesses of San Martino
- Marquesses of San Martino
- Marquesses of San Marzano
- Marquesses of San Michele Arcangelo
- Marquesses of San Miguel das Penas y La Mota
- Marquesses of San Miguel de Aguayo
- Marquesses of San Miguel de Penas y La Mota
- Marquesses of San Nicolás
- Marquesses of San Rafael
- Marquesses of San Raffaele
- Marquesses of San Román
- Marquesses of San Román-II
- Marquesses of San Tommaso
- Marquesses of San Vicente
- Marquesses of San Vicente del Barco
- Marquesses of Sande
- Marquesses of Sanseverino
- Marquesses of Sant' Agata
- Marquesses of Sant' Erasmo
- Marquesses of Santa Ágata
- Marquesses of Santa Ana
- Marquesses of Santa Ana y Santa María
- Marquesses of Santa Cristina
- Marquesses of Santa Croce
- Marquesses of Santa Cruz
- Marquesses of Santa Cruz
- Marquesses of Santa Cruz de Aguirre
- Marquesses of Santa Cruz de Marcenado
- Marquesses of Santa Cruz de Paniagua
- Marquesses of Santa Cruz de Ribaduya
- Marquesses of Santa Cruz-br
- Marquesses of Santa Elena
- Marquesses of Santa Fe de Guardiola
- Marquesses of Santa Fé de Guardolia
- Marquesses of Santa Iria
- Marquesses of Santa Lucia
- Marquesses of Santa María de Carrizo
- Marquesses of Santa Maria de Otavi
- Marquesses of Santa Maria de Silvela
- Marquesses of Santa María del Villar
- Marquesses of Santa Marina