Koopmann is a surname. Notable people with the surname include:
Erwin Koopmann, recipient of Knight's Cross of the Iron Cross Jörg Koopmann (born 1968), German photographer Karl Koopmann or Karl Koppmann (died 1905), German historian, archivist, authority on the Hanseatic League Pascal Koopmann (born 1990), German footballer
See also Koopman