Thomas Francis Meagher (; August 3, 1823July 1, 1867) was an Irish nationalist and leader of the Young Irelanders in the Rebellion of 1848. After being convicted of sedition, he was first sentenced to death, but received transportation for life to Van Diemen's Land in Australia. In 1852 he escaped and made his way to the United States, where he settled in New York City. There Meagher studied law, worked as a journalist, and traveled to present lectures on the Irish cause and married for a second time.