Gustavus Hamilton, 2nd Viscount Boyne PC (Ire) (1710–1746) was an Irish politician and an enthusiastic admirer of Italy and the Carnival of Venice.

Viscount Boyne, in the province of Leinster, is a title in the Peerage of Ireland. It was created in 1717 for the Scottish military commander Gustavus Hamilton, 1st Baron Hamilton of Stackallan. He had already been created Baron Hamilton of Stackallan, in the County of Meath in 1715, also in the Peerage of Ireland. Hamilton was the youngest son of Sir Frederick Hamilton, youngest son of Claud Hamilton, 1st Lord Paisley, third son of James Hamilton, 2nd Earl of Arran. His grandson, the second Viscount, represented Newport in the House of Commons. His first cousin, the fourth Viscount, sat as a member of the Irish House of Commons for Navan.