Stephen III of Moldavia (also known as Stefan the Great, Romanian: Ștefan cel Mare, or Ștefan cel Mare și Sfânt, "Stefan the Great and Holy"; 1433 – July 2, 1504) was Prince of Moldavia between 1457 and 1504 and the most prominent representative of the House of Mușat.
During his reign, he strengthened Moldavia and maintained its independence against the ambitions of Hungary, Poland, and the Ottoman Empire, which all sought to subdue the land. Stephen achieved fame in Europe for his long resistance against the Ottomans. He was victorious in 46 of his 48 battles, and was one of the first to gain a decisive victory over the Ottomans at the Battle of Vaslui, after which Pope Sixtus IV deemed him verus christianae fidei athleta (true Champion of Christian Faith). He was a man of religion and displayed his piety when he paid the debt of Mount Athos to the Porte, ensuring the continuity of Athos as an autonomous monastical community.