John Bourke, 4th Earl of Mayo, (English: /bɜːrk/; BURK; 18 June 1766 – 23 May 1849) was an Irish peer and courtier, styled Lord Naas (/neɪs/; NAYSS) from 1792 to 1794, who served as Chairman of Committees in the Irish House of Lords until 1801.

He was the eldest son of Joseph Deane Bourke, 3rd Earl of Mayo (Archbishop of Tuam 1782–94) and his wife, Elizabeth, daughter of Sir Richard Meade, 3rd Baronet.

[2] On 20 February 1810, he was sworn of the Privy Council of Ireland and was elected an Irish representative peer on 2 March 1816.

On 11 May 1819, he represented the Duke of Clarence and St Andrews (later William IV) at the baptism of Prince George of Cambridge in Hanover and was appointed a GCH that year.

[4] On 24 May 1792, Mayo had married Arabella Mackworth-Praed (1766–1843), daughter of William Mackworth Praed of Bitton House, Devon; they had no children.