The International Pentecostal Holiness Church (IPHC) or simply Pentecostal Holiness Church (PHC) is an international Holiness-Pentecostal Christian denomination founded in 1911 with the merger of two older denominations. Historically centered in the Southeastern United States, particularly the Carolinas and Georgia, the Pentecostal Holiness Church now has an international presence. In 2000, the church reported a worldwide membership of over one million—over three million including affiliates.

Pentecostalism or classical Pentecostalism is a Protestant Charismatic Christian movement that emphasizes direct personal experience of God through baptism with the Holy Spirit. The term Pentecostal is derived from Pentecost, an event that commemorates the descent of the Holy Spirit upon the Apostles and other followers of Jesus Christ while they were in Jerusalem celebrating the Feast of Weeks, as described in the Acts of the Apostles.