Classen is a surname. Notable people with the surname include: Aimée Classen, American ecologist Andy Classen, German musician, sound engineer and record producer Carl Joachim Classen (1928–2013), German classical scholar Edmond Classen (1938–2014), Dutch actor Erin Classen (born 2004), Australian squash player Johannes Classen, German educator and classical philologist See also Claasen's law (formulated by Theo A. C. M. Claasen) Classen School of Advanced Studies Klassen