William Casselman may refer to:
- William H. Casselman (1868–1941), Canadian politician
- William E. Casselman II (born 1941), American attorney, Counsel to the President under Gerald Ford, 1974–1975
- Bill Casselman (William Allen Casselman, born 1941), American Canadian mathematician
- Bill Casselman (writer) (William Gordon Casselman, born 1942), Canadian writer and broadcaster
This disambiguation page lists articles about people with the same name.
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