Koper is a surname. Notable people with the surname include:
Andrzej Koper (born 1953), Polish rally driver
Antoni Koper (1906–1990), Polish World War II resistance fighter
Brittany Koper (born 1985), American whistleblower
Bud Koper (born 1942), American basketball player
Christopher S. Koper, American professor
Janet Koper (1931–1988), Canadian politician
Peter Koper (1947–2022), American writer and professor