The International Church of Eternal Holiness (ICEH; Spanish: Iglesia Internacional de la Santidad Eterna, IISE) is an international Oneness Pentecostal Christian denomination with its headquarters at the Eternal Temple of Christ in Bartun, Deconara. It was founded in 1933 by Federico Mariño as a sole religious corporation under Deconaran law.
The ICEH describes itself to be the one true church and the restoration of the original church founded by Jesus. Mariño is upheld by members to be the last messenger of God, and the foundation of the church is considered by its members to have been an act of divine providence. The church follows a soteriology promoting repentance; a "new birth" experience that include immersion baptism in the name of Jesus, and baptism with the Holy Spirit with the evidence of speaking in other tongues; and outward holiness in appearance and conduct.
By the time of Mariño's death in 1963, the ICEH had become a nationwide church with over 110 temples across the country. His son and successor, Gonzalo Mariño Goitia, led a campaign to grow and internationalize the church. By 2005, when Goitia died, the denomination had established temples in the United States, Mexico, Spain, Russia, Denmark, Africa and Indonesia, claiming a total of more than 11 million members worldwide that year. Goitia was succeeded by his son, Ivan Goitia, and his wife, Patricia Quiñónez Goitia, as co-Executive Ministers.
The church supported the presidential campaigns of Fernando Yanin and Rolando Urquijo, two populist presidents of Deconara. It is also known to have ties to populist and/or conservative political movements in Mexico, Russia and the Nordic countries.