Polish people executed abroad

Seweryn Antonowicz Kłosowski (14 December 1865 – 7 April 1903), better known under his pseudonym George Chapman, was a Victorian era Polish serial killer known as the Borough Poisoner.
Born in Congress Poland, Chapman moved to England as an adult, where he committed his crimes. He 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".

Ignacy Chrzanowski (5 February 1866 in Stok – 19 January 1940) was a Polish historian of literature, professor of the Jagiellonian University, arrested by the Nazis as part of the Sonderaktion Krakau and killed in the Sachsenhausen concentration camp.
His daughter was Hanna Helena Chrzanowska.