Look up Klopfenstein in Wiktionary, the free dictionary.
Klopfenstein is a surname. Notable people with the surname include:
- Amélie Klopfenstein (born 2002), Swiss alpine skier
- Joe Klopfenstein (born 1983), American football player
- Scott Klopfenstein (born 1977), American singer and multi-instrument musician
- Willy Klopfenstein (1921–2002), Swiss ski jumper