Frederick I, Count of Weimar-Orlamünde

Frederick I (died 25 July 1365) was Count of Weimar-Orlamünde of the Ascanian line, son of Count Herman IV. In 1322 he married Elisabeth, daughter of Friedrich Klemm and widow of Otto II of Anhalt.

He was the last count to rule the county in his own right; his successor and brother Hermann VI held it as a fief of the Wettin margraves of Meissen. His son was Frederick III the Younger.