Dukes | Titles by Rank
- Dukes of La Mirandola
- Dukes of la Palata-H
- Dukes of la Palata-I
- Dukes of La Roca
- Dukes of La Roche-Guyon
- Dukes of La Rochefoucauld
- Dukes of la Torre
- Dukes of La Tremoille
- Dukes of la Unión de Cuba
- Dukes of La Valette
- Dukes of La Vallière
- Dukes of la Vauguyon
- Dukes of la Vega
- Dukes of la Victoria
- Dukes of la Victoria de las Amézcoas
- Dukes of La Vieuville
- Dukes of Laaland
- Dukes of Laconia
- Dukes of Lafões
- Dukes of Lancaster
- Dukes of Langeland
- Dukes of las Torres
- Dukes of Lauderdale
- Dukes of Lauenburg
- Dukes of Laurenzana
- Dukes of Laurino
- Dukes of Lauzun
- Dukes of Laval
- Dukes of Lavedan
- Dukes of Lécera
- Dukes of Leeds
- Dukes of Leinster
- Dukes of Leinster-a
- Dukes of Lennox
- Dukes of Lennox
- Dukes of Lerma
- Dukes of Lesdiguières
- Dukes of Lesparre
- Dukes of Leuchtenberg
- Dukes of Lévis
- Dukes of Liancourt
- Dukes of Liegnitz
- Dukes of Lillebonne
- Dukes of Limburg
- Dukes of Linares
- Dukes of Linhares
- Dukes of Longueville
- Dukes of Looz and Corswarem
- Dukes of Lorena-Aumale
- Dukes of Lorge