Henry III of Honstein-Sondershausen

Henry III of Honstein (c. 1256–1305) was a count of the Honstein dynasty who ruled its southern Harz lands around Honstein, Arnstadt and Sondershausen. He was the son of Count Henry I of Honstein and Mechtild of Regenstein. Before 1282 he married Jutta, daughter of Count Otto II of Ravensberg.

His son Henry V kept Sondershausen after him, and another son, Dietrich IV, also ruled there as count. Henry III died in 1305, and Jutta died shortly before him.