Klopp is a German surname. Notable people with the surname include:
Jürgen Klopp (born 1967), German football player and manager
Nico Klopp (1894–1930), Luxembourgian painter
Onno Klopp (1822-1903), German historian
Paul Klopp (born 1957), politician in Ontario, Canada
Reid Klopp (born 1984), USA-born US Virgin Islands soccer player
Stan Klopp (1910–1980), Major League Baseball pitcher
Erika Klopp Verlag, German children's literature publisher