Nicholas Cusack

Colonel Nicholas Cusack (c.1638 – September 1726) was an Irish Jacobite politician and soldier.

Cusack was the third son of James Cusack of Cushinstown and Frances, daughter of Sir William Talbot, 1st Baronet and sister of Richard Talbot, 1st Earl of Tyrconnell. He was a great-grandson of Sir Thomas Cusack, Lord Chancellor of Ireland.

In 1688 he appears on a charter of James II of England as a burgess of Navan. His brother-in-law Chief Justice John Keating, the brother of his wife Catherine, played a prominent role in the Parliament.

During the Williamite War in Ireland, Cusack initially served as a captain in his uncle, Tyrconnell's, regiment of horse. He later became a Jacobite colonel. During the second Siege of Limerick, he was among the confidants of Patrick Sarsfield, 1st Earl of Lucan who encouraged the Jacobite commander to sue for peace. Following the surrender of Limerick, Cusack was appointed as one of the Jacobite commissioners tasked with negotiating terms with the Williamites, and he was one of the signatories of the Articles of Limerick on 3 October 1691. He was outlawed later that year and fled to France where he served in the Irish Brigade of the French Royal Army. He died at Château de Saint-Germain-en-Laye in 1726.