The 28th International Eucharistic Congress begins in Chicago, with over 250,000 spectators attending the opening procession.

The 28th International Eucharistic Congress was held in Chicago, Illinois, United States from June 20 to 24, 1926. The event, held by the Catholic Church, was a eucharistic congress, which is a large scale gathering of Catholics that focuses on the Eucharist and other items of Catholic faith. The event was organized by Cardinal George Mundelein, the Archbishop of Chicago, and was the first International Eucharistic Congress held in the United States and the second held in North America. Cardinal Giovanni Bonzano served as the papal legate for the event. The event attracted a large number of people to the city, with most sources claiming at least several hundred thousand attendees. Large events were held throughout the area, at locations including Soldier Field, Holy Name Cathedral, and the Saint Mary of the Lake Seminary. Some sources claim that approximately 1 million people attended the closing day Mass held at the seminary in nearby Mundelein, Illinois.

Chicago is the most populous city in the U.S. state of Illinois and in the Midwestern United States. Located on the western shore of Lake Michigan, it is the third-most populous city in the United States with a population of 2.74 million at the 2020 census, while the Chicago metropolitan area has 9.41 million residents and is the third-largest metropolitan area in the nation. Chicago is the seat of Cook County, the second-most populous county in the United States.

June 20 is the 171st day of the year in the Gregorian calendar; 194 days remain until the end of the year.