Klaassen

Klaasen is Dutch patronymic surname ("son of Klaas"). Notable people with this name include:


 * Arno Klaassen (born 1979), Dutch bobsledder
 * Davy Klaassen (born 1993), Dutch footballer
 * Jozef Klaassen (born 1983), Dutch rower
 * (1920–1992), Dutch economist
 * Mihkel Klaassen (1880–1952), Estonian Supreme Court judge
 * Nel Klaassen (1906–1989), Dutch sculptor
 * René Klaassen (born 1961), Dutch field hockey player
 * Fred Klaassen (born 1992), Dutch cricketer
 * Ryan Klaassen, lead plaintiff in the 2021 vaccine law case Klaassen v. Indiana University


 * Klaassens
 * Jan Klaassens (1931–1983), Dutch footballer