Surname: O'Brien | Name index | #D
207 people
- Daniel O' Brien, viscount Clare
- Hon. Deirdre Jane Frances O' Brien * 1924
- Dermod O' Brien, 2nd baron Inchiquin
- Dermod O'Brien, 5th Baron of Inchiquin
- Dermot O'Brien, 5th Baron of Inchiquin
- Desmond Barnaby O'Brien * 1926
- Diarmaid O'Brien, 2nd Baron of Inchiquin
- Dionysius P. A. O'Brien * 1934
- Domhnall macConchobhair O'Brien, 1st viscount Clare
- Domhnall O'Brien
- Donal O'Brien
- Donnchadh macConchobhair O'Brien, 4th earl of Thomond
- Donnchadh O'Brien, 2nd Earl of Thomond
- Donnchadh O'Brien, 4th Earl of Thomond
- Donnel More O'Brien, King of Munster
- Donough Edward Foster O' Brien, 16th baron Inchiquin * 1897
- Donough O'Brien * 1595
- Donough O'Brien * 1519
- Donough O'Brien, 1st baronet
- Sir Donough O'Brien, 1st baronet
- Donough O'Brien, 2nd earl of Thomond
- Dora Letitia O'Brien
- Hon. Doreen O'Brien
- Drew Richard O'Brien