William Clapp

William Clapp may refer to:
 * William J. Clapp (1857–1934), American attorney and educator
 * William H. Clapp (1879–1954), American painter and art curator
 * William F. Clapp (1880–1951), specialist in mollusks at Harvard University's Museum of Comparative Zoology
 * Bill Clapp, social entrepreneur, philanthropist and business executive
 * Will Clapp (born 1995), American football center