Iglesia ni Cristo is an independent nontrinitarian Christian church, founded in 1913 and registered by Felix Y. Manalo in 1914 as a sole religious corporation of the Insular Government of the Philippines.

Nontrinitarianism is a form of Christianity that rejects the mainstream Christian theology of the Trinity—the belief that God is three distinct hypostases or persons who are coeternal, coequal, and indivisibly united in one being, or essence. Certain religious groups that emerged during the Protestant Reformation have historically been known as antitrinitarian.