William Kemp may refer to:
- William Kempe (also spelled William Kemp), 17th century English actor and dancer, one of the original actors in William Shakespeare's plays
- William D. Kemp (architect), architect
- William E. Kemp, mayor of Kansas City, Missouri, U.S.
- Will Kemp (actor), contemporary film actor
- Willy Kemp, road bicycle racer from Luxembourg
- Willie Kemp, Scottish singer and writer