The Eastern Catholic Church is the “other lung” of the Catholic Church, as Pope John Paul II once said. The Catholic Church is actually made up of 23 independent Catholic Churches, all united under the authority of the pope. The Latin Catholic Church is so large, however, that most people are unaware of the existence of the other 22 eastern branches, which are relatively small in membership. Almost all of them are formerly groups of Orthodox Christians that decided at some point in the past to reunite, en masse, with the Catholic Church. There is an equivalent Orthodox Church for every Eastern Catholic Church, with the exceptions of the Maronite Catholic Church and the Italo-Albanian Catholic Church, which never broke away from Rome. It is important to note that ALL of the branches of the Catholic Church are equally Catholic. They all obey the pope, and Catholics of any branch are welcome to participate fully in the services and sacraments of any other branch. Eastern Catholic Churches have their own canon law, and celebrate their own liturgical traditions, including different versions of the Mass, which are known in the Eastern Catholic Church as the Divine Liturgy. Their services would be virtually identical to those offered by the various Orthodox Churches.
Here is a listing of the various Eastern Catholic Churches:
*** Alexandrian liturgical tradition**
1) Coptic Catholic Church (patriarchate): Egypt (1741)
2) Ethiopian Catholic Church (metropolia): Ethiopia, Eritrea (1846)
** * Antiochian (Antiochene or West-Syrian) liturgical tradition**
3) Maronite Church (patriarchate): Lebanon, Cyprus, Jordan, Israel, Palestine, Egypt, Syria, Argentina, Brazil, United States, Australia, Canada, Mexico (union re-affirmed 1182)
4) Syriac Catholic Church (patriarchate): Lebanon, Iraq, Jordan, Kuwait, Palestine, Egypt, Sudan, Syria, Turkey, United States and Canada, Venezuela (1781)
5) Syro-Malankara Catholic Church (major archiepiscopate): India, United States (1930)
** * Armenian liturgical tradition:**
6) Armenian Catholic Church (patriarchate): Lebanon, Iran, Iraq, Egypt, Syria, Turkey, Jordan, Palestine, Ukraine, France, Greece, Latin America, Argentina, Romania, United States, Canada, Eastern Europe (1742)
** * Chaldean or East Syrian liturgical tradition:**
7) Chaldean Catholic Church (patriarchate): Iraq, Iran, Lebanon, Egypt, Syria, Turkey, United States (1692)
8) Syro-Malabar Church (major archiepiscopate): India, United States (at latest, 1599)
** * Byzantine (Constantinopolitan) liturgical tradition:**
9) Albanian Greek Catholic Church (apostolic administration): Albania (1628)
10) Belarusian Greek Catholic Church (no established hierarchy at present): Belarus (1596)
11) Bulgarian Greek Catholic Church (apostolic exarchate): Bulgaria (1861)
12) Byzantine Church of the Eparchy of Križevci (an eparchy and an apostolic exarchate): Croatia, Serbia and Montenegro (1611)
13) Greek Byzantine Catholic Church (two apostolic exarchates): Greece, Turkey (1829)
14) Hungarian Greek Catholic Church (an eparchy and an apostolic exarchate): Hungary (1646)
15) Italo-Albanian Catholic Church (two eparchies and a territorial abbacy): Italy (Never separated)
16) Macedonian Greek Catholic Church (an apostolic exarchate): Republic of Macedonia (1918)
17) Melkite Greek Catholic Church (patriarchate): Syria, Lebanon, Jordan, Israel, Jerusalem, Brazil, United States, Canada, Mexico, Iraq, Egypt and Sudan, Kuwait, Australia, Venezuela, Argentina (1726)
18) Romanian Church United with Rome, Greek-Catholic (major archiepiscopate): Romania, United States (1697)
19) Russian Catholic Church: (two apostolic exarchates, at present with no published hierarchs): Russia, China (1905); currently about 20 parishes and communities scattered around the world, including five in Russia itself, answering to bishops of other jurisdictions
20) Ruthenian Catholic Church (a sui juris metropolia, an eparchy, and an apostolic exarchate): United States, Ukraine, Czech Republic (1646)
21) Slovak Greek Catholic Church (metropolia): Slovak Republic, Canada (1646)
22) Ukrainian Greek Catholic Church (major archiepiscopate): Ukraine, Poland, United States, Canada, Great Britain, Australia, Germany and Scandinavia, France, Brazil, Argentina (1595)