*1054 [[Great Schism|Great Schism between East and West]], generally regarded as having been completed by the act of the Fourth Crusade in 1204.

===Within Orthodoxy===

*1265-1310 Arsenite Schism.

*1935 [[Old Calendarists|Old Calendar Schism]], when three bishops declared their separation from the official [[Church of Greece]] stating that the calendar change was a schismatic act.

*1990 Ukrainian Orthodox Church-Kiev Patriarchate (UOC-KP).

----

===Roman Catholic===

*1957 The "[[w:Chinese Catholic Patriotic Association|Chinese Catholic Patriotic Association]]" (the official state-approved Church) is established by the People's Republic of China's Religious Affairs Bureau, to exercise state supervision over mainland China's Catholics; the unofficial (Papal) Church continues function as a separate entity.

===Eastern Catholic Churches===

The Vatican's [[w:Annuario Pontificio|Annuario Pontificio]] gives the following list of 22 Eastern Catholic Churches and of countries in which they possess an episcopal ecclesiastical jurisdiction (date of union or foundation in parenthesis):