Henry John Schlacks (July 4, 1867 – January 6, 1938) was primarily known as an ecclesiologist in a 19th Century sense of the word, meaning one who designs and decorates churches. He was from Chicago, Illinois, and is considered by many to be the finest of Chicago's church architects. Schlacks trained at MIT and in the offices of Adler & Sullivan before starting his own practice. He founded the Architecture Department at the University of Notre Dame and designed several buildings in the Chicago area.
Among the Churches that Schlacks designed are:
- St. Adalbert Church
- St. Anthony Church
- St. Boniface Church 
- St. Clara Church, Woodlawn Avenue
- St. Gelasius Church
- St. Ignatius Church
- St. Ita Church 
- St. John of God Church
- St. Mary of the Lake Church, 1917 
- St. Paul Church
- St. Martin of Tours Church (Schlacks was supervising architect for this building, plans supplied by a German architect)
- Angel Gurdian Croatian Catholic Mission Church 
- St. Nicholas Church
- St. John Lutheran Church
- St. Edmund Church 
- St. Peter Church
- St. Joan of Arc Church
- Holy Name-Mater Dei Church
- St. Mark Church 
- Denver & Rio Grande Western Railroad Depot, Grand Junction, Colorado, 1906
- Denver & Rio Grande Western Station, Salt Lake City, Utah, 1910
- Idaho Building (Boise, Idaho)
- Schlacks, Henry John (1903). The work of Henry John Schlacks, ecclesiologist. Press of the Henneberry Co.
- Chicago, American Institute of Architects (2014-05-15). AIA Guide to Chicago. University of Illinois Press. ISBN 9780252096136.
- information on the planned reuse of St. Bonafice Church
- http://www.institute-christ-king.org/home/ St. Gelasius is being restored as Shrine of Christ the King
- "Archived copy". Archived from the original on 2009-11-23. Retrieved 2006-04-14. St Ita Church History
- http://designslinger.com/2010/09/27/a-schlacksed-saint.aspx?results=1#SurveyResultsChart St. Mary of the Lake Church and Schlacks
- The Brickbuilder. Rogers and Manson Company. 1900.
- https://www.flickr.com/photos/brulelaker/3604097355/ Now known as Chicago Embassy Church
- "Archived copy". Archived from the original on 2012-07-23. Retrieved 2006-04-14. Croation Church was former St. Henry Church
- "Archived copy". Archived from the original on 2011-07-27. Retrieved 2006-04-14. Oak Park Historical Society, St. Edmund Church
- Bodenhamer, David J.; Barrows, Robert G. (1994-11-22). The Encyclopedia of Indianapolis. Indiana University Press. ISBN 0253112494.
- http://www.restorestmarks.org Archived 2010-12-29 at the Wayback Machine. St. Mark's is currently the subject of a restoration campaign.
- The Western Architect. Western architect publishing Company. 1910.
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