John Arthur Getreu (born August 26, 1944) is an American murderer and possible serial killer who was convicted of one murder in 1963 that took place in West Germany and convicted of a second that took place in 1974 in the United States. He is also charged with another murder, committed in California in 1973, which means he could be an international serial killer. He is yet to stand trial for that one. He is currently serving life imprisonment at Richard J. Donovan Correctional Facility.