Birger Wasenius (7 December 1911 – 2 January 1940) was a Finnish World Champion in speed skating.

Wasenius reached the world top in 1933 when he won a silver medal at the European Allround Championships.

Most of the gold medals those days went to Norwegian skater Ivar Ballangrud.

Finally, at the 1939 World Allround Championships of Helsinki, his city of birth, Wasenius became World Allround Champion, winning the 1,500 m and finishing second on the other three distances.

At the end of 1939, the Winter War between Finland and the Soviet Union broke out, and Wasenius was killed early 1940 while fighting for the Finnish army on the islands of Lake Ladoga.