Ambrosios Pleianthidis was a Greek Orthodox metropolitan bishop who served the community of Moschonisia in the Ottoman Empire during the early 20th century. Born in Smyrna in 1872, he held various ecclesiastical roles, including serving as a priest in Crimea. Following the Greco-Turkish War, he was appointed to lead the newly established metropolis on Cunda Island. His life ended in 1922 when he was executed by the Turkish Army during the conflict's conclusion, an event that led to his recognition as a saint.