Leszek Jacek Pekalski, also known as the Vampire of Bytów (born 12 February 1966 in Osieki near Bytów, Poland) is a Polish serial killer.
He is believed to have killed at least 17 people between 1984 and 1992.
At some stage of criminal procedures he admitted to having killed as many as 80 people, but he later retracted his confessions.
Nevertheless, due to problems with the collection of evidence, he was convicted for only one murder.
Pekalski is set to be released in December 2017, then transferred to a National Center for the Prevention of Dyssocial Behavior in Gostynin for evaluation.