Alexander Ypsilantis, Ypsilanti, or Alexandros Ypsilantis (; ; ; 12 December 1792 – 31 January 1828) was 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 coordinated 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.