| Honorific Prefix: | The Right Honourable |
| The Earl of Mayo | |
| Office1: | Member of the Irish House of Lords |
| Term Label1: | Hereditary Peerage |
| Term Start1: | 13 January 1781 |
| Term End1: | 1790 |
| Predecessor1: | New Creation |
| Successor1: | John Bourke |
| Office2: | Member of Parliament for Naas |
| Term Start2: | 1768 |
| Term End2: | 1776 |
| Alongside2: | John Bourke |
| Term Start3: | 1727 |
| Term End3: | 1760 |
| Office4: | Member of Parliament for Old Leighlin |
| Term Start4: | 1761 |
| Term End4: | 1768 |
| Birth Name: | John Bourke |
| Birth Date: | 1705 |
| Nationality: | Irish |
| Alma Mater: | Trinity College, Dublin |
| Children: | 3, including: John Bourke, 2nd Earl of Mayo |
John Bourke, 1st Earl of Mayo (; ; circa 1705 – 1790), styled Lord Naas (;) from 1775 to 1781 and Viscount Mayo from 1781 to 1785, was an Irish politician and peer who was MP for Naas (1727–60, 1768–72) and Old Leighlin (1760–68) and was created Earl of Mayo (1785).
He was the son of Richard Bourke (d.1727) and Catherine Minchin, daughter of Charles Minchin of Ballynakill, County Tipperary. He was descended from Gaelic nobles, and shared a common ancestor with Tibbot ne Long Bourke, 1st Viscount Mayo. He was educated at Trinity College, Dublin.[1] [2]
In 1727, he was elected as the Member of Parliament for Naas, representing the seat in the Irish House of Commons until 1760. Between 1761 and 1768 he served as MP for Old Leighlin. He was re-elected for Naas in 1768, and held the seat until his elevation to the peerage in 1776. That year was created Baron Naas, of Naas in the County of Kildare, in the Peerage of Ireland.[3] He assumed his seat in the Irish House of Lords, and on 13 January 1781 he was made Viscount Mayo, a title which had previously been held by his distant relations. On 24 June 1785 Bourke was made Earl of Mayo.
Bourke married Mary Deane (d.1774), daughter of Joseph Deane and Margaret Boyle, in 1726. Together they had three children. The Naas constituency was also represented by Bourke's son and grandson, the second and fourth earls.
| Crest: | A Cat-a-Mountain sejant guardant proper, collared and chained Or. |
| Escutcheon: | Party per fess Or and Ermine, a cross gules the first quarter charged with a lion rampant sable and the second with a dexter hand couped at the wrist and erect gules |
| Motto: | A CRUCE SALUS (Salvation from the Cross) |
| Supporters: | On either side a Chevalier in complete Armour, holding in the exterior hand a Pole-Axe, all proper.[4] [5] |
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