The Baltic Sea Division () was a 10,000 man German military unit commanded by Rüdiger von der Goltz. During the Finnish Civil War, in April 1918, it landed at Hanko and moved towards Helsinki and Lahti. The Baltic Sea Division quickly took back Helsinki from the Social Democrats of Finland, who had previously deposed the official government in Helsinki. This enabled the Senate to come back to Helsinki.
The division was requested by the FinnishSenate of Vaasa to help the Whites. The Senate of Finland urged the people of Finland to provide food, shelter, and any other aid needed by the Baltic Sea Division.