奥古斯特三世，有时被以绰号称为撒克逊或臃肿者（德语：August III. von Polen; 波兰语：August III. Sas, August III. Gruby），在1733年到1763年间，为萨克森选王侯，称为弗里德里希·奥古斯特二世 (德语：Kurfürst Friedrich August II.)，在1734年到1763年间，为波兰国王和立陶宛大公，绰号「肥胖王」。

Augustus III (Polish:August III, Lithuanian:Augustas III; 17 October 1696 – 5 October 1763) was King of Poland and Grand Duke of Lithuania from 1734 until 1763, as well as Elector of Saxony in the Holy Roman Empire from 1733 until 1763 where he was known as Frederick Augustus II (German:Friedrich August II).