Henry I, Count of Nassau-Beilstein (1307–1388) was a son of Henry I of Nassau-Siegen and his wife, Adelaide of Heinsberg-Blankenberg.
His parents had initially destined him for an ecclesiastical career.
However, he later married Meyna of Westerburg and after his father's death became the first count of Nassau-Beilstein.
Henry and Meyna had three children:
This article about a German count is a stub.