Helmhold III, Count of Schwerin (died 1295) was a German nobleman. He was a son of Count Gunzelin III of Schwerin-Boizenburg and Margaret of Mecklenburg. Helmhold III was the ruling Count of Schwerin-Neustadt and Marnitz from 1274 until his death.
Helmold married twice. His first wife was Mathilda (some sources call her Margaret; d. 1265), a daughter of Albert I, Duke of Saxony. Together, they had three children:
After Mathilda's death, Helmold married Margaret, the daughter of Eric I, Duke of Schleswig. This marriage remained childless.