Orthodox Church

Orthodox Church may refer to:


 * Eastern Orthodox Church, the second-largest Christian church
 * Oriental Orthodox Churches, a branch of Eastern Christianity
 * Orthodox Presbyterian Church, a confessional Presbyterian denomination located primarily in the United States
 * Orthodox Presbyterian Church of New Zealand, a denomination formed in the 1960s led by George Mackenzie
 * State church of the Roman Empire, Roman Empire's state religion after 380 CE
 * True Orthodox church, a movement within Eastern Orthodox Christianity