John Steven Siemianowski (born May 26, 1960) is an American priest of the Catholic Church who was appointed as auxiliary bishop for the Archdiocese of Chicago in 2024.
Siemianowski was born in Chicago on May 26, 1960, at the family of the Polish immigrants.
[1] He earned a degree in environmental sciences from Southern Illinois University.
Siemianowski was ordained to the priesthood for the Archdiocese of Chicago on May 20, 1989.
[2] Pope Francis appointed Siemianowski auxiliary bishop for the Archdiocese of Chicago, assigning him the titular see of Gratianopolis on December 20, 2024.