Karl-Birger Blomdahl (October 19, 1916 - June 14, 1968) was a Swedish composer and conductor born in Växjö. He was educated in biochemistry, but was primarily active in music and by his experimental compositions he became one of the big names in Swedish modernism. In 1959 he composed the opera Aniara based on the book by Harry Martinson. He died in Kungsängen, Stockholm.