Seweryn Klosowski (14 December 1865 – 7 April 1903), better known under his pseudonym George Chapman, was a Polish serial killer known as the Borough Poisoner.
Born in Congress Poland, he moved to England as an adult, where he committed his crimes.
Chapman was convicted and executed after poisoning three women, but is remembered today mostly because some contemporary police officers suspected him of being the notorious serial killer Jack the Ripper.