Jacek Leociak (born 2 June 1957, in Warsaw) is a Polish literary scholar and historian as well as author.

Leociak received a Ph.D. in 1996 at the Institute of Literary Research of the Polish Academy of Sciences with a dissertation on the Warsaw ghetto.

[1] In 2008, he was awarded the Knight's Cross of the Order of Polonia Restituta for "his important contributions to exploring, collecting, and popularizing the information on the Holocaust as well as his activism for remembering the history of the Warsaw Ghetto Uprising".

[4] In May 2019, he received a nomination for Poland's top literary prize, the Nike Award, for his work Młyny boże.

[1] Together with Barbara Engelking, he published the book The Warsaw Ghetto: A Guide to the Perished City, which first appeared in Polish in 2001.