Joseph Leeson, 2nd Earl of Milltown (1730 – 27 November 1801), styled Viscount Russborough between 1763 and 1783, was an Irish peer.

Leeson was the son of Joseph Leeson, 1st Earl of Milltown

Joseph Leeson, 1st Earl of Milltown

Joseph Leeson, 1st Earl of Milltown was an Irish peer and politician.-Background:He was the son of Joseph Leeson, who was a brewer in Dublin, and Mary Brice, daughter of Alderman Andrew Brice, Sheriff of Dublin...

, by Cecilia, daughter of Francis Leigh, of Rathangan. He was elected to the Irish House of Commons

Irish House of Commons

The Irish House of Commons was the lower house of the Parliament of Ireland, that existed from 1297 until 1800. The upper house was the House of Lords...

 for Thomastown

Thomastown (Parliament of Ireland constituency)

Thomastown was a constituency represented in the Irish House of Commons until 1800. Following the Act of Union 1800 the borough was disfranchised.-1692–1801:-See also:*Thomastown, a town in County Kilkenny*Irish House of Commons...

 in 1757, a seat he held until 1761. He became known by the courtesy title

Courtesy title

A courtesy title is a form of address in systems of nobility used for children, former wives and other close relatives of a peer. These styles are used 'by courtesy' in the sense that the relatives do not themselves hold substantive titles...

 Viscount Russborough when his father was elevated to an earldom in 1763. In 1783 he succeeded in the earldom and took his seat in the Irish House of Lords

Irish House of Lords

The Irish House of Lords was the upper house of the Parliament of Ireland that existed from mediaeval times until 1800. It was abolished along with the Irish House of Commons by the Act of Union.-Function:...

.

Lord Milltown died in November 1801 and was succeeded by his younger brother, Brice.