John Mitchel (; 3 November 1815 – 20 March 1875) was an Irish nationalist activist, author, and political journalist. In the Famine years of the 1840s he was a leading writer for the "Nation" produced by the Young Ireland group and their splinter from Daniel O'Connell's Repeal Association, the Irish Confederation. As editor of his own paper, the "United Irishman", in 1848 Mitchel was sentenced to 14-years penal transportation, penalty for his advocacy of James Fintan Lalor's programme of co-ordinated resistance to exactions of landlords and to the continued shipment of harvests to England.