Eparchy of Saint Thomas the Apostle of Chicago Eparchia Sancti Thomae Apostoli Chicagiensis Syrorum-Malabarensium | |
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 Mar Thoma Sleeha Cathedral, Bellwood, Illinois | |
 Coat of arms | |
| Location | |
| Country | United States |
| Territory | United States |
| Metropolitan | Exempt directly to Holy See and the Congregation for the Oriental Churches |
| Headquarters | Diocesan Center 310 W. Lake Street Elmhurst, IL 60126 |
| Statistics | |
| Population - Catholics | (as of 2022) 87,000 |
| Churches | 50 |
| Congregations | 35 (Missions) |
| Information | |
| Denomination | Catholic Church |
| Sui iuris church | Syro-Malabar Church |
| Rite | East Syriac Rite |
| Established | March 13, 2001 (23 years ago) |
| Cathedral | Mar Thoma Sleeha Cathedral |
| Patron saint | Thomas the Apostle |
| Language | Malayalam & English |
| Current leadership | |
| Pope | Francis |
| Major Archbishop | Mar Raphael Thattil |
| Bishop | Joy Alappatt |
| Auxiliary Bishops | Vacant |
| Vicar General | |
| Bishops emeritus | Jacob Angadiath |
| Website | |
| www.stthomasdiocese.org | |
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The Eparchy of St. Thomas Syro-Malabar Catholic of Chicago, also known as the St. Thomas Syro-Malabar Diocese of Chicago, is a Syro-Malabar Catholic Church ecclesiastical territory or eparchy of the Catholic Church in the United States. Its episcopal seat is the Mar Thoma Sleeha Cathedral in the episcopal see of Chicago in Illinois state.
The Most Reverend Mar Joy Alappatt is the current bishop of the Eparchy, having served since October 2022. Mar Jacob Angadiath served as the Eparchy's first bishop from its establishment in 2001 until his retirement in July 2022. The Eparchy is not part of any ecclesiastical province, but is immediately subject to the Holy See and depends on the Dicastery for the Oriental Churches.
The eparchy was erected by Pope John Paul II on 13 March 2001. It is one of the four eparchies of the Syro-Malabar Church outside India. In fact the Chicago Eparchy is the first ecclesiastical territory of the Syro-Malabar Church outside India. It has jurisdiction over all Syro-Malabar Catholics in the United States, including Knanaya Catholics in the US.