Oscar II (Oscar Fredrik January 21, 1829 –December 8, 1907) is King of Sweden from 1872 until his death, and the last Bernadotte King of Norway from 1872 until his dethronement in 1905.

Oscar is king during a time when Sweden is undergoing a period of industrialization and rapid technological progress.

His reign also sees the gradual decline of the Union of Sweden and Norway, which culminates in its dissolution in 1905.

He is subsequently succeeded as King of Norway by his grandnephew Prince Carl of Denmark under the regnal name Haakon VII, and as King of Sweden by his eldest son, Gustaf V.

Harald V, the present king of Norway, is a great-grandson of Oscar II, through his third son Prince Carl, Duke of Västergötland.