Viscount Mayo is a title that has been created twice in the Peerage of Ireland

Peerage of Ireland

The Peerage of Ireland is the term used for those titles of nobility created by the English and later British monarchs of Ireland in their capacity as Lord or King of Ireland. The creation of such titles came to an end in the 19th century. The ranks of the Irish peerage are Duke, Marquess, Earl,...

, both times for members of the Bourke family. The first creation came in 1627 in favour of Tiobóid na Long Bourke, also known as Theobald Bourke. He was the son of Sir Richard Bourke and Gráinne O'Malley. The second Viscount was created a Baronet in the Baronetage of Nova Scotia in c. 1638. His son, the third Viscount, was also created a Baronet in the Baronetage of Nova Scotia in c. 1638 (although there are no records of this creation in the Great Seal). The third Viscount was executed in 1652 after being found guilty of murder by Cromwell's High Court of Justice in Connaught. On the eighth Viscount's death in 1767, the title became dormant or extinct. The title was recreated for a cousin, John Bourke, 1st Lord Naas, in 1781. He was subsequently created Earl of Mayo

Earl of Mayo

Earl of the County of Mayo, usually known simply as Earl of Mayo, is a title in the Peerage of Ireland. It was created in 1785 for John Bourke, 1st Viscount Mayo, for many years First Commissioner of Revenue in Ireland...

 in 1785. See this title for more information.

Viscounts Mayo; First creation (1627)

• Tiobóid na Long Bourke, 1st Viscount Mayo (d. 1629)
• Miles Bourke, 2nd Viscount Mayo (d. 1649)
• Theobald Bourke, 3rd Viscount Mayo (d. 1652)
• Theobald Bourke, 4th Viscount Mayo (d. 1676)
• Miles Bourke, 5th Viscount Mayo (d. 1681)
• Theobald Bourke, 6th Viscount Mayo (1681–1741)
• Theobald Bourke, 7th Viscount Mayo (d. 1742)
• John Bourke, 8th Viscount Mayo (d. 1767)
  • Hon. Aylmer Bourke (1743–1748)