Reformed churches

The Reformed churches are a group of Protestant denominations historically related by a similar Zwinglian or Calvinist system of doctrine but organisationally independent. Each nation in which the Reformed movement was originally established had its own church government. Several of these local churches have expanded to worldwide denominations and most have experienced splits into multiple denominations. Commitment to teaching the original Calvinism usually continues to be reflected in their official definitions of doctrine, but in some cases is no longer necessarily typical of these churches. A 1999 survey found 746 Reformed denominations worldwide.

Reformed churches in Korea

• Presbyterian Church in Korea (Kosin ??). The PCK is a Reformed denomination in Korea which accepts the Westminster standards as its confession. The church also recognizes "Three Forms of Unity", to be same as the Westminster Standards. Kosin church wants to be a biblical and confessional denomination, pure in doctrine and life. There are about 2,000 local churches, including some churches in North America and Europe.
• The Korean Presbyterian Church (Hapdong ??) which formed the primary body of the Presbyterian General Assembly (the Reformed Church in Korea) was established by missionaries of the Presbyterian Church (USA), and Canadian and Australian Presbyterians.