Augustus I or Paul Frederick Augustus was the reigning Grand Duke of Oldenburg from 1829 to 1853.

The Grand Duchy of Oldenburg was a grand duchy within the German Confederation, North German Confederation and German Empire that consisted of three widely separated territories: Oldenburg, Eutin and Birkenfeld. It ranked tenth among the German states and had one vote in the Bundesrat and three members in the Reichstag.