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In the Roman Catholic church, a Eucharistic Congress is a gathering of clergy, religious, and laity to bear witness to the Real Presence of Jesus in the Eucharist, which is an important Roman Catholic doctrine.
Congresses bring together people from a wide area, and typically involve large open-air Masses, adoration of the Eucharist (Blessed Sacrament), and other devotional ceremonies held over several days. Congresses may both refer to National (varies by country) and International Eucharistic Congresses.
 19th and 20th century
The first International Eucharistic Congress owed its inspiration to Bishop Gaston de Ségur, and was held at Lille, France, 21 June 1881. The idea at first was merely local and met with few adherents, but it grew from year to year with an ever-increasing importance. The sixth congress met in Paris, 2–6 July 1888, and the great memorial church of the Sacred Heart on Montmartre was the centre of the proceedings. Antwerp entertained the next congress, 15–21 August 1890; an immense altar of repose was erected in the Place de Meir, and an estimated 150,000 persons were gathered about it when Cardinal Goossens, Archbishop of Mechlin, gave the solemn Benediction. Bishop Doutreloux of Liège was then president of the Permanent Committee for the Organization of Eucharistic Congresses, the body which has charge of the details of these meetings. Of special importance also was the eighth congress, held in Jerusalem in 1893.
In 1907, the congress was held in Metz, Lorraine, and the German Government suspended the law of 1870 (which forbade processions), in order that the usual solemn procession of the Blessed Sacrament might be held. Each year the congress had become more and more definitely international, and at the invitation of Archbishop Bourne of Westminster it was decided to hold the nineteenth congress in London, the first among English-speaking members of the Church.
The presidents of the Permanent Committee of the International Eucharistic Congresses, under whose direction all this progress was made, were: Bishop Gaston de Ségur of Lille; Archbishop de La Bouillerie, titular of Perga and coadjutor of Bordeaux; Archbishop Duquesnay of Cambrai; Cardinal Mermillod, Bishop of Lausanne and Geneva; Bishop Doutreloux of Liège, and Bishop Thomas Heylen of Namur, Belgium. After each congress this committee prepared and published a volume giving a report of all the papers read and the discussions on them in the various sections of the meeting, the sermons preached, the addresses made at the public meetings, and the details of all that transpired.
The 19th International Eucharistic Congress was held in London in 1908.
The 20th International Eucharistic Congress was held in Cologne in 1909.
The 21st International Eucharistic Congress was held in Montreal in 1910.
The 22nd International Eucharistic Congress was held in Madrid in 1911.
The 24th International Eucharistic Congress was held in Malta in April 1913.
The 25th International Eucharistic Congress was held in Lourdes, 22–25 July 1914.
The 26th International Eucharistic Congress was held in Rome, 24–29 May 1922.
The 27th International Eucharistic Congress was held in Amsterdam, 22–27 June 1924.
 28th International Eucharistic Congress, Chicago
In 1926 the 28th International Eucharistic Congress was held in Chicago from June 20–24. Cardinal Bonzano was the papal legate and the host was George Cardinal Mundelein, Archbishop of Chicago. Mass for a crowd estimated at 500,000 was held at the recently completed Soldier Field Stadium. Closing mass at St. Mary of the Lake Seminary had nearly a million worshippers.
 29th International Eucharistic Congress, Sydney
 31st International Eucharistic Congress, Dublin
In 1932, the 31st International Eucharistic Congress was held in Dublin, Ireland from 22–26 June, that year being the 1,500th anniversary of Saint Patrick's arrival in Ireland. There were 3,171,697 Catholics in Ireland in 1932, and the Congress theme was "The Propagation of the Sainted Eucharist by Irish Missionaries."
 32nd International Eucharistic Congress, Buenos Aires
The 32nd International Eucharistic Congress was held in Buenos Aires, Argentina in October 1934 with Cardinal Eugenio Pacelli, who later was named Pope Pius XII, serving as papal legate to the congress.
More than one million people gathered in Palmero Park, and nearby, to hear, over loudspeakers, a greeting and benediction from the pope, which was broadcast from Vatican City radio. A Pontifical High Mass was celebrated by Cardinal Pacelli, who, at the close of the congress, pronounced the Apostolic blessing on participants.
 33rd International Eucharistic Congress, Manila
The congress was attended by approximately one and a half million people from all over the world, and included a religious procession of 600,000 people. Pontifical masses were held in Rizal Park, with hundreds of thousands of people attending.
 34th International Eucharistic Congress, Budapest
Over 100,000 people from all over the world attended the congress, including 15 cardinals and 330 bishops. The theme for the congress was “Eucharist the Bond of Love.”
 35th International Eucharistic Congress, Barcelona
The 35th International Eucharistic Congress was held from May 27 to June 1, 1952, in Barcelona, Spain. It was the first Eucharistic congress to be held since the ending of World War II. Its overriding theme was “Peace.”
The congress was attended by hundreds of Catholic bishops and other church officials, including Cardinal Francis Spellman of New York, and Cardinal Samuel Stritch of Chicago. Because of the "Cold War," attendance by Catholics from eastern European countries uunder communist control was limited.
 36th International Eucharistic Congress, Rio de Janeiro
 37th International Eucharistic Congress, Munich
The 37th International Eucharistic Congress was held from July 31 to August 7, 1960 in Munich, West Germany, a site chosen by Pope Pius XII who had previously served there as a papal nuncio. The congress was attended by approximately 430 bishops and 28 cardinals, including Cardinal Francis Spellman of New York, Cardinal Richard Cushing of Boston, and Cardinal Albert Gregory Meyer of Chicago.
The congress laid a foundation stone for a “church of atonement” to be built near the Dachau concentration camp of World War II. At the close of the congress, a Statio Orbis Mass was celebrated on the Theresienwiese, a large square in Munich.
 38th International Eucharistic Congress, Mumbai
The 38th Eucharistic Congress was held in Mumbai (Bombay) India in 1964. Its objective was disseminating the continuing Catholic belief that the "real prersence of Christ was in the eucharist." Attending the congress were Pope Paul VI, a large number of cardinals, and an estimated 20,000 foreign visitors.
 39th International Eucharistic Congress, Bogotá
The 39th International Eucharistic Congress was held in Bogotá, Colombia, in 1968. Its theme was "The Eucharist and the Bond of Love." Attending the congress were Pope Paul VI, Archbishop Coleman F. Carroll of Miami, and Archbishop John Francis Dearden of Detroit.
 40th International Eucharistic Congress, Melbourne
 41st International Eucharistic Congress, Philadelphia
In 1976 the 41st International Eucharistic Congress was held in Philadelphia in August, that year being the 200th anniversary of independence for the United States. The theme was Jesus, the bread of life. John Cardinal Krol was Philadelphia's Archbishop. The Mass held at Municipal (J.F. Kennedy) Stadium was attended by U.S. president Gerald R. Ford.
 42nd International Eucharistic Congress, Lourdes
The 42nd Congress was held at Lourdes, France, from 16 to 23 July 1981. Its theme was "Hungers of the Human Family. This is the third time that the congress was held at Lourdes. Previously it had been held there in 1899 and 1914."
 43rd International Eucharistic Congress, Nairobi
 44th International Eucharistic Congress, Seoul
The 44th international congress was held in Seoul, South Korea, from 4 to 8 October 1989. Its theme was "Christ is our Peace." Attending the Congress were Cardinal Sue-Hwan Stephen Kim and Pope John Paul ll. Specially, Pope held the Solemn Mass entirely in Korean on the concluding day. The number of average attendee, excluding the parties of the Congress, was recorded to be 1 million.
Its two principal objectives were:
- promoting a deeper understanding of the eucharist and
- living the eucharistic faith in the reality of our world.
 45th International Eucharistic Congress, Seville
Pope John Paul II addressed the congress and declared: "I hope the fruit of this congress results in the establishment of perpetual eucharistic adoration in all parishes and Christian communities throughout the world."
 46th International Eucharistic Congress, Wrocław
The theme of this congress was "Freedom as Reflected in the Eucharist." The congress addressed the distinction between "freedom" and "liberty."
 Twenty-first century
 47th International Eucharistic Congress, Rome
 48th International Eucharistic Congress, Guadalajara
The 48th International Eucharistic Congress was held in Guadalajara, Jalisco, Mexico from 10 to 17 October 2004. Pope John Paul II, being too ill to attend, named Cardinal Josef Tomko as Papal Legate. The Congress ended with a celebration of the Mass in the Jalisco Stadium in Guadalajara, with a live link up between that Mass, and a simultaneous Mass celebrated in St Peter's Basilica in Rome in the presence of Pope John Paul II. These simultaneous Masses marked the beginning of the Year of the Eucharist which ran from the International Eucharistic Congress to the General Assembly of the Synod of Bishops in October 2005. At the end of the Mass, the Pope announced the location of the next Congress.
 49th International Eucharistic Congress, Quebec City
In May 2007, a Youth Summit was held at the University of Laval in preparation for the 49th International Eucharistic Congress. This took place in Quebec City, 15–22 June 2008, commemorating the 400th anniversary of the city's founding. The theme of the Congress was "The Eucharist, Gift of God for the Life of the World". The closing celebration took place on the Plains of Abraham, attended by tens of thousands of pilgrims. Pope Benedict XVI's message was broadcast live, in both French and English, from the Apostolic Palace in the Vatican, via giant screens set up on the meadow. The Pope announced the next Congress was to take place in Dublin, in 2012:
Dear Friends, as this significant event in the life of the Church draws to a close I invite you to join me in praying for the Success of the next International Eucharistic Congress, which will take place in 2012 in the city of Dublin! I take this opportunity to greet warmly the people of Ireland, as they prepare to host this ecclesial gathering. I am confident that they, together with all the participants at the next Congress, will find it a source of lasting spiritual renewal.
 50th International Eucharistic Congress, Dublin
The 50th International Eucharistic Congress took place in Dublin, Ireland from 10–17 June 2012. It coincided with the 50th anniversary of the inauguration of the Second Vatican Council. The theme of the Congress, drawn from Lumen gentium, 7 was The Eucharist: Communion with Christ and with one another. The Congress was more than just an event in 2012. In an interview with Vatican Radio, Fr. Kevin Doran, Secretary General of the Congress explained that people were invited to take a journey of pastoral preparation in advance of the Congress. Most Congress activities in 2012 took place at the Royal Dublin Society. The Statio Orbis (closing ceremony) took place at the Croke Park sports stadium. In addition to the daily celebration of the Eucharist, there were upwards of thirty workshops and presentations each day on various themes associated with the Eucharist, (prayer, social justice, family, art, community, disability and inclusion) and such was the demand that some of these had to be repeated, or played on large outdoor screens. There were exhibitions covering a wide range of activities and services which helped to demonstrate the life of the Church in all it's diversity and richness. The past fifteen years have seen the Church struggling to face the reality of failure to respond appropriately to the reality of child abuse by clergy and religious. The blessing of a Healing Stone by Archbishop Diarmuid Martin and a personal meeting between the Papal Legate, Cardinal Marc Ouellet and survivors, were among a number of ways in which this aspect of the Church's call to conversion and healing were reflected during the Congress. The Canadian Catholic TV Network Salt and Light has a full archive of the events of the Congress 
 51st International Eucharistic Congress, Cebu
During Pope Benedict XVI's pontifical address to the 50th international eucharistic congress in Croke Park, Ireland, the pontiff announced that Cebu, Philippines would host the 51st International Eucharistic Congress.
 Sixth National Eucharistic Conference, Madras
In 1937, the sixth National Eucharistic Conference was held in Madras. Silver Souvenir medals with scalloped edges, with the inscription ADOREMUS IN AETERNUM SANCTISSIMUM SACRAMENTUM were made available at the time. This inscription was around the scalloped edges with the picture of the Holy Eucharist and the Vatican in the background. At the back of the medal was inscribed SOUVENIR OF THE SIXTH NATIONAL EUCHARIST CONGRESS MADRAS, 1937.
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- Pacelli: http://www2.fiu.edu/~mirandas/bios-p.htm
- The Sydney Morning Herald, October 16j, 1934 http://trove.nla.gov.au/ndp/del/article/17126952
- Cebu city: http://www.mb.com.ph/articles/363837/cebu-city-hosting-the-51st-international-eucharistic-congress-in-2016
- Pacelli http://www2.fiu.edu/~mirandas/bios-p.htm
- History of the Eucharistic Congresses http://www.pwt.wroc.pl/kongres/en/historia/dzieje.htm
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- Pope Paul's Visit to Bogota http://library.stu.edu/ulma/va/3005/1968/08-23-1968.pdf
- "Origins of the 2008 IEC". Retrieved 2008-06-22.
- "Pope: "Due Honour to Eucharistic Rite"- Dublin to Host Congress 2012". Vatican Radio. 2008-06-22. Retrieved 2008-06-22.
- Eucharistic Congress exactly what Irish Church needs . Vatican Radio Interview with Fr. Kevin Doran, Secretary General of the 50th International Eucharistic Congress. (Broadcast 2010-10-22; Retrieved 2010-12-31)
- http://saltandlighttv.org/iec/iec-2012-videos/. Missing or empty
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- The 1926 Cardinal's Train to the 28th International Eucharistic Congress in Chicago at ThemeTrains.com.
- Catholic Encyclopedia
- List on the Vatican`s WebSite of the International Eucharistic Congresses
- Official Website for the 2008 Eucharistic Conference
- 49th International Eucharistic Congress: Photo Gallery by The Catholic Photographer
- Official Website for the 2012 Eucharistic Conference
- The Cardinal's Train to the 28th IEC in 1926