Euthymios (Agritellis) was an Orthodox bishop of Zela who served the Diocese of Zela near Amasia in the Ottoman Empire. Born in 1876 on the island of Lesbos, he was educated at the Leimonos Monastery and later at the Theological School of Halki. He was appointed as an assistant bishop in 1912, overseeing a vast region during a period of intense conflict. He is remembered for his efforts to support and protect the Greek population in Pontus during the Greek genocide, eventually facing martyrdom in 1921.