James Dillon may refer to: James Dillon (officer) (c. 1600 - after 1669), Irish Confederate officer James Dillon (bishop) (1738–1806), Roman Catholic Bishop of Kilmore, Ireland James Dillon (Irish senator) (died 1955), farmer who served in the Senate of the Irish Free State James Dillon (Fine Gael politician) (1902–1986), Irish politician and leader of the Fine Gael party James Dillon, 3rd Earl of Roscommon (c. 1605–1649), leader of the Royalist forces in Ireland James Dillon (composer) (born 1950), Scottish composer often regarded as belonging to the New Complexity school James Dillon (Australian politician) (1880–1949), Victorian State politician for the electoral district of Essendon J. J. Dillon (born 1942), retired American professional wrestler and manager James Dillon, 1st Earl of Roscommon (died 1642), Irish peer