Euthymius of Constantinople may refer to:
Euphemius of Constantinople, also called Euthymius, Ecumenical Patriarch in 490–496 Euthymius I of Constantinople, Ecumenical Patriarch in 907–912 Euthymius of Constantinople (11th century) (fl. 1050) Euthymius II of Constantinople, Ecumenical Patriarch in 1410–1416