The title Baron Oranmore and Browne, of Carrabrowne Castle in the County of the Town of Galway and of Castle Macgarrett in the County of Mayo, was created in 1836 in the Peerage of Ireland. In 1926, the 3rd Baron was created Baron Mereworth, of Mereworth Castle in the County of Kent, in the Peerage of the United Kingdom. The Baronies remain united.

Barons Oranmore and Browne (1836)

• Dominick Browne, 1st Baron Oranmore and Browne (1787-1860)
• Geoffrey Dominick Augustus Frederick Guthrie-Browne, 2nd Baron Oranmore and Browne (1819-1900), elected a Representative Peer in 1869
• Geoffrey Henry Browne, 3rd Baron Oranmore and Browne (1861-1927), elected a Representative Peer in 1902
• Dominick Geoffrey Edward Browne, 4th Baron Oranmore and Browne (1901-2002)
• Dominick Geoffrey Thomas Browne, 5th Baron Oranmore and Browne (b. 1929)