Schloss Oldenburg is a schloss, or palace, in the city of Oldenburg in the present-day state of Lower Saxony, Germany. It is the former residence of the counts (1667–1785), dukes (1785–1815) and grand dukes (1815–1918) of Oldenburg.
The building now houses part of the State Museum for Art and Cultural History, especially its decorative arts and local history exhibitions, as well as some old master paintings. Immediately outside the palace to the west and north is the Schlossplatz. Opposite it, to the north, is the Schlosshöfe shopping mall, opened in 2011. To the south are the Prinzenpalais and Augusteum, also part of the State Museum for Art and Cultural History. To the southwest is the Elisabeth-Anna-Palais, adjacent to the Schlossgarten Oldenburg, the main public park in Oldenburg.