James S. Donnelly, Jr. (born 1943) is a retired emeritus professor of history at the University of Wisconsin–Madison, where he specialised in nineteenth-century Irish history. He is a leading figure in the subfield of Irish studies in North America. Donnelly is a former president of the American Conference for Irish Studies, and a current co-editor of the journal Éire-Ireland. His research on An Gorta Mór (1845–51) made him a well-known historian in the debate on whether The Great Hunger was genocide or not.
He is the author of:
Captain Rock: The Irish Agrarian Rebellion of 1821-1824. (2009).
Encyclopedia of Irish History and Culture. (2004). editor and chief.
The Great Irish Potato Famine. (2001).
Irish Popular Culture 1650-1850. (1999), co-edited with Kerby A. Miller.
Irish Peasants: Violence & Political Unrest, 1780-1914. (1983), co-edited with Samuel Clark.
The Land and the People of Nineteenth-Century Cork: The Rural Economy and Land Question. 1975 (which was awarded the Herbert Baxter Adams Prize of the American Historical Association)
Landlord and Tenant in Nineteenth-Century Ireland. (1973).