Schlapp is a surname. Notable people with the surname include:
Alyce Louise Schlapp (1912–1999), American politician George E. Schlapp (1839–1912), American brewer Lothar Schlapp (born 1960), German footballer Matt Schlapp (born 1967), American political activist and lobbyist Mercedes Schlapp (born 1972), American communications specialist and political commentator Robert Schlapp (1899–1991), British physicist and mathematician of German descent