Alexander Ypsilantis, Ypsilanti, or Alexandros Ypsilantis (Romanian: Alexandru Ipsilanti; 1792–1828) is a member of a prominent Phanariot Greek family, a prince of the Danubian Principalities, a senior officer of the Imperial Russian cavalry during the Napoleonic Wars, and a leader of the Filiki Eteria, a secret organization that coordinates the beginning of the Greek War of Independence against the Ottoman Empire.

He should not be confused with his namesake grandfather, a Prince of Wallachia and Moldavia at the end of the 18th century.