Barons | Titles by Rank
- Barons of Dietrichstein-Nikolsburg
- Barons of Dincklage
- Barons of Dinis Samuel
- Barons of Djar il-Bniet
- Barons of Doblhoff
- Barons of Doblhoff-Dier
- Barons of Domecy
- Barons of Dompvast
- Barons of Donghelberghe-Corbeke
- Barons of Donnersmarck
- Barons of Donzy
- Barons of Dores de Guaxupé
- Barons of Dorilli
- Barons of Dornberg
- Barons of Dörnberg
- Barons of Dourado
- Barons of Dourados
- Barons of Dramelay
- Barons of Drehna
- Barons of Drouas
- Barons of Drumlanrig
- Barons of Drummond
- Barons of Duas Barras
- Barons of Duas Barras-I
- Barons of Dungern
- Barons of Dunsany
- Barons of Duparchy
- Barons of Duprat
- Barons of Dürfeld
- Barons of Durtal
- Barons of Dworzak
- Barons of Eberstein
- Barons of Echauffour
- Barons of Edling
- Barons of Egloffstein
- Barons of Ehrenburg
- Barons of Eickstedt
- Barons of Eimar de Jabrun
- Barons of Eisemann
- Barons of Eisenbach
- Barons of Ejerica
- Barons of Eka e Lindö
- Barons of Ellrichshausen
- Barons of Elmendorff
- Barons of Elst
- Barons of Eltz-Rübenach
- Barons of Elverfeldt
- Barons of Elverfeldt-Ulm
- Barons of Embaré
- Barons of Ende