William C. Christianson (December 5, 1892 – May 27, 1985) was an American jurist. He was one of the judges at the Nuremberg Military Tribunals
William Christian Christianson was born in Moody County, South Dakota. He was the son of Christian O. Christianson (1857-1937) and Karen (Holter) Christianson (1862-1936). Christianson went to school in Austin, Minnesota and Jasper, Minnesota. He attended Highland Park College and then received his law degree from University of Chicago Law School in 1920. Christianson was assistant county attorney for Goodhue County, Minnesota and Red Wing, Minnesota city attorney. Christianson served on the Minnesota Supreme Court for a brief time in 1946. In 1948 and 1949, Christianson was one of the judges of the Nuremberg Military Tribunals. In 1949, Christianson was appointed a Minnesota District Court judge and served until his retirement in 1963.
Christianson was married to Myrtle Lorenz who died in 1977. Christianson died in Red Wing, Minnesota during 1985. He was buried at Oakwood Cemetery in Goodhue County, Minnesota.