General Sir James Duff (1752–1839) was a British army officer, who fought in the Napoleonic wars [1] and Member of Parliament (1784–1789).

While there he rendered important services during the Irish Rebellion of 1798, and managed to keep his district quiet in spite of the state of affairs elsewhere.

His name is associated with the Gibbet Rath executions where men under his command massacred several hundred people, who had previously received amnesty.

[1] He had as aides-de-camp during his Limerick command two famous officers, William Napier and James Dawes Douglas.

[5][6] On 12 August 1785, Duff married Basilia (d. 1849), daughter and heir of James Dawes, of Rockspring, Jamaica, through whom he gained control of a considerable fortune.