William C. Kahl (September 21, 1908 – February 7, 2001) was an American educator.
Kahl was born September 21, 1908, at Mount Horeb, Wisconsin. Kahl graduated from the University of Wisconsin–Madison. He then was a teacher and principal at various schools. In 1966, Kahl was appointed Wisconsin Superintendent of Public Instruction. Kahl was then elected to the office, serving until 1973.
He died February 7, 2001.