Barons | Titles by Rank
- Barons of Araruna
- Barons of Aratanha
- Barons of Araújo Ferraz
- Barons of Araújo Góis
- Barons of Araújo Gondim
- Barons of Araújo Maia
- Barons of Arcodaci
- Barons of Arcossó
- Barons of Arcs
- Barons of Ardore
- Barons of Arede Coelho
- Barons of Areia Larga
- Barons of Areias de Cambra
- Barons of Aréizaga
- Barons of Arenós
- Barons of Aretin
- Barons of Argamassa
- Barons of Arinos
- Barons of Ariró
- Barons of Ariza
- Barons of Arnfels
- Barons of Arnim
- Barons of Arroio Grande
- Barons of Arruda
- Barons of Arruda-a
- Barons of Ascheberg
- Barons of Assunção
- Barons of Astier de La Vigerie
- Barons of Atalaia
- Barons of Ataliba Nogueira
- Barons of Atibaia
- Barons of Attems
- Barons of Auersperg
- Barons of Aujargues
- Barons of Auteuille
- Barons of Authon
- Barons of Avanhadava
- Barons of Avelar e Almeida
- Barons of Avelar Resende
- Barons of Aver-o-Mar
- Barons of Avola
- Barons of Ayerbe
- Barons of Aylva van Pallandt
- Barons of Azeredo Coutinho
- Barons of Azevedo Machado
- Barons of Azzolino
- Barons of Bagê
- Barons of Baisy
- Barons of Ballesteros
- Barons of Balorre