Earl of the County of Mayo is a title in the Peerage of Ireland. Though the theoritical style includes "County," in practice, only "Earl of Mayo" is used. The subsidiary titles held along with the earldom are: Viscount Mayo (created 1781) and Baron Mayo (1776).
Earls of Mayo (1785)
- John Bourke, 1st Earl of Mayo (c. 1705-1790)
- John Bourke, 2nd Earl of Mayo (c. 1735-1792)
- Joseph Deane Bourke, 3rd Earl of Mayo (c. 1740-1794)
- John Bourke, 4th Earl of Mayo (1766-1849), elected a Representative Peer in 1816
- Robert Bourke, 5th Earl of Mayo (1797-1867), elected a Representative Peer in 1852
- Richard Southwell Bourke, 6th Earl of Mayo (1822-1872)
- Dermot Robert Wyndham Bourke, 7th Earl of Mayo (1851-1927), elected a Representative Peer in 1890
- Walter Longley Bourke, 8th Earl of Mayo (1859-1939)
- Ulick Henry Bourke, 9th Earl of Mayo (1890-1962)
- Terence Patrick Bourke, 10th Earl of Mayo (b. 1929)