House of O'Brien

• Coat of Arms
• 

  House of O'Brien
  Dál gCais
  Ancient arms

• 

  House of O'Brien
  Kings and Princes of Thomond
  Chiefs of O'Brien

• 

  House of O'Brien
  Barons Inchiquin
  Earls of Inchiquin
  Earls and Marquesses of Thomond
  Viscounts Clare

• Cadet Branches
• 

  House of O'Grady
  Lords of Cinel Dunghaile and Kilballyowen
  Viscounts Guillamore

• 

  House of O'Kennedy
  Lords of Ormond
  High Chiefs of Ormond Upper and Ormond Lower

• 

  House of MacMahon
  Lords of Corcabaskin
  Marquess of Eguilly and Dukes of Magenta