Frederick IV of Meissen and Elector of Saxony (Frederick the Belligerent (the Warlike)) (11 April 1370 – 4 January 1428) is Margrave of Meissen and Elector of Saxony from 1381 until his death.
He is not to be confused with his cousin Frederick IV, Landgrave of Thuringia, the son of Balthasar, Landgrave of Thuringia.
Frederick the Warlike is never Landgrave of Thuringia.