Joel Langelott (or Langellott, Langelot) (1617–1680) was a German physician and alchemical writer.
He was born in Thuringia. He became court physician to Frederick IV, Duke of Holstein-Gottorp.
He was a traveler in England, and contributed to the Philosophical Transactions for 1672[1].
His best known chemical work is the Epistola ad praecellentissimos naturae curiosos of 1672.[2]