The fourth season of the historical drama television series Vikings premiered on February 18, 2016 on History in Canada. The series broadly follows the exploits of the legendary Viking chieftain Ragnar Lothbrok and his crew, and later those of his sons. The first season of the series begins at the start of the Viking Age, marked by the Lindisfarne raid in 793.
The fourth season consists of a double order of twenty episodes, split into two parts of ten episodes; the second half premiered on November 30, 2016. The season follows the battles between Ragnar and Rollo in Francia, Bjorn's raid into the Mediterranean, and the Viking invasion of England. It concluded in its entirety on February 1, 2017.