Fourth Council of Constantinople

Fourth Council of Constantinople (also Eighth Ecumenical Council) may refer to:
 * Fourth Council of Constantinople (Roman Catholic) that took place in 869–870
 * Fourth Council of Constantinople (Eastern Orthodox) that took place in 879–880

Четвърти Константинополски събор Concilio di Costantinopoli VI Concilium Constantinopolitanum Quartum Sobór Konstantynopolitański IV Четвёртый Константинопольский собор