Augustus III (German: August III.; Polish: August III Sas – "the Saxon"; Lithuanian: Augustas III; 17 October 1696 – 5 October 1763) was King of Poland and Grand Duke of Lithuania from 1733 until 1763, as well as Elector of Saxony in the Holy Roman Empire where he was known as Frederick Augustus II (German: Friedrich August II.).
He was the only legitimate son of Augustus II the Strong, and converted to Catholicism in 1712 to secure his candidacy for the Polish throne. In 1719 he married Maria Josepha, daughter of Joseph I, Holy Roman Emperor, and became elector of Saxony following his father's death in 1733.