John Tuthill Bagot (15 February 1819 – 13 August 1870) was a South Australian politician. Bagot was the second son of Charles Bagot, of Kilcoursie House, King's County, Ireland, by Anna, eldest daughter of John Tuthill, of Kingsland, co. Limerick. Though described as Charles Hervey Bagot's nephew their actual relationship was more distant. J. T. Bagot was admitted to the Irish bar. He married in 1848 Eliza, daughter of John Meyler.