John S. Siemianowski

His Excellency, The Most Reverend John Steven Siemianowski
Auxiliary Bishop of Chicago Titular Bishop of Gratianopolis
Archdiocese	Chicago
Appointed	December 20, 2024
Installed	February 26, 2025
Other post	Titular Bishop of Gratianopolis
Orders
Ordination	May 20, 1989
Consecration	February 26, 2025 by  Blase J. Cupich, Robert Gerald Casey, and Jeffrey S. Grob
Personal details
Born	(1960-05-26) May 26, 1960 (age 65) Chicago, Illinois, US
Education	Southern Illinois University Mundelein Seminary
Motto	Make all things new

Styles of John S. Siemianowski
Reference style	His Excellency The Most Reverend
Spoken style	Your Excellency
Religious style	Bishop

John Steven Siemianowski (born May 26, 1960) is an American prelate of the Roman Catholic Church who has been serving as an auxiliary bishop for the Archdiocese of Chicago in Illinois since 2025

Early life

John Siemianowski was born in Chicago on May 26, 1960, to Lydia and Joseph Siemianowski. ^[1] As a teenager, he attended Morton East High School in Cicero, Illinois. He earned a Bachelor of Science degree in environmental sciences and a Secondary Education Certificate in 1982 from Southern Illinois University at Edwardsville. Deciding to become a priest, Siemianowski in 1984 entered University of St. Mary of the Lake Mundelein Seminary in Mundelein, Illinois. He received a Master of Divinity degree and a Baccalaureate in Sacred Theology degree in 1989. ^[2]

Priesthood

Siemianowski was ordained to the priesthood for the Archdiocese of Chicago on May 20, 1989. ^[3] After his ordination, the archdiocese assigned Siemianowski as an associate pastor at the following Illinois parishes:

• St. Francis de Sales in Lake Zurich
• St. Mary in Buffalo Grove
• St. Elizabeth Seton in Orland Hills ^[2]

Siemianowski was later named pastor of St. Agnes, St. Paul, and St. Kieran Parish, in Chicago Heights, Illinois. He became pastor in 2021 of St. Juliana Parish in Chicago. ^[2]

Auxiliary Bishop of Chicago

Pope Francis appointed Siemianowski as titular bishop of Gratianopolis and as an auxiliary bishop of Chicago on December 20, 2024. ^{[3] [2] [4]} Siemianowski was consecrated as a bishop on February 26, 2025, at Holy Name Cathedral in Chicago by Cardinal Blase Cupich. ^{[4] [5]}

See also

• Catholic Church hierarchy
• Catholic Church in the United States
• Historical list of the Catholic bishops of the United States
• List of Catholic bishops of the United States
• Lists of patriarchs, archbishops, and bishops

References

1. "Ks. Robert Fedek i ks. John Siemianowski zostaną biskupami pomocniczymi Archidiecezji Chicagowskiej". DS (in Polish).
2. "Pope Francis Names New Auxiliary Bishops of Chicago" . Retrieved December 20, 2024.
3. "Resignations and Appointments, 20.12.2024" . Retrieved December 20, 2024.
4. "Pope Francis Names Five New Auxiliary Bishops for the Archdiocese of Chicago". Archdiocese of Chicago.
5. "Bishop John Steven Siemianowski [Catholic-Hierarchy]". www.catholic-hierarchy.org. Retrieved 2025-08-01.

External links

• Roman Catholic Archdiocese of Chicago official site

Episcopal succession

Catholic Church titles
Preceded by -	Auxiliary Bishop of Chicago 2025-present	Succeeded by -