William Edward Kapp (August 20, 1891 in Toledo – 1969) was an American architect. He earned his architectural degree at the University of Pennsylvania. For the majority of his career, he worked for the firm Smith, Hinchman & Grylls.
Kapp is known as the lead architect on a number of buildings including the following:
- The Players, a clubhouse in Detroit, Michigan (1925)
- Meadow Brook Hall (1926–1929)
- Wilson Theatre (now the Music Hall Center for the Performing Arts) in Detroit, Michigan (1928)
- The Horace H. Rackham School of Graduate Studies Building, University of Michigan, Ann Arbor, Michigan (1938) 
- Temple Israel in Detroit, Michigan (1949)
- Flint Journal Building in Flint, Michigan (Addition only) (1952–1954) 
- Moran, Darby. "Historical Architecture of Grosse Pointe- William Edward Kapp". Higbie Maxon Agney Relators.
- Hill, Eric J. (2003). AIA Detroit : the American Institute of Architects guide to Detroit architecture. Detroit: Wayne State University Press. pp. 346. ISBN 0814331203. OCLC 50422861.
- Kathryn Bishop Eckert (2001). Cranbrook: An Architectural Tour. Princeton Architectural Press. pp. 144–. ISBN 978-1-56898-257-1.
- "About – History of The Players". www.playersdetroit.org. Retrieved 2019-08-29.
- "MotorCities - Meadow Brook Hall Looks Back to Automotive Elegance". www.motorcities.org. Retrieved 2019-08-29.
- "History of the Rackham Building". rackham.umich.edu. Retrieved 2019-09-28.
- "Flint Journal Building". www.nps.gov. Retrieved 2019-08-29.