Augustus I may refer to:
Augustus, Elector of Saxony (1526–1586) Augustus I, Duke of Brunswick-Lüneburg (1568–1636) Augustus, Grand Duke of Oldenburg (1783–1853) Sigismund II Augustus (1520–1572), King "Augustus I" of Poland and Grand Duke of Lithuania (c. 1766–c. 1835), French engraver
See also Frederick Augustus (disambiguation) Ernest August