Koop is a surname. Notable people with the surname include:
Aire Koop (born 1957), Estonian actress Arnold Koop (1922–1988), Estonian historian, university rector Bill Koop (1906–1950), Australian footballer Doug Koop (born 1960), Australian footballer C. Everett Koop (1916–2013), US Surgeon General Mary Koop (1884–1967), British artist Volker Koop (1945–2022), German non-fiction author, opinion writer, and journalist Wanda Koop (born 1951), Canadian painter
See also Koop (disambiguation) Coop (disambiguation) Koepp