Herman IV, Count of Weimar-Orlamünde

Herman IV, in another numbering Herman V (died 1319), was a count of Weimar-Orlamünde and a son of Otto III. After their father's death in 1285 he ruled the county jointly with his brother Otto IV. In 1290 he married Mechthild of Rabenswalde.

Of his nine children, his son Frederick followed him as count, while another son, John, became a Teutonic Order commander at Weimar. His epitaph is in the chapel of St. Elizabeth at Naumburg.