Alexandros Ypsilantis (Greek: Αλέξανδρος Υψηλάντης; Romanian: Alexandru Ipsilanti; Russian: Александр Константинович Ипсиланти Aleksandr Konstantinovich Ipsilanti; 12 December 1792 – 31 January 1828) was a Greek nationalist politician who was 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.