Protestant Church in Western Indonesia

The Protestant Church in Western Indonesia (Indonesian: Gereja Protestan di Indonesia bagian Barat, abbreviated as GPIB) is a Reformed Church, and its theology is based on the teaching of John Calvin.

It was called the "De Protestantse Kerk in Westelijk Indonesie", founded in 1605 in Ambon, Moluccas.

In its formative years it consisted of seven classes: Jabar, Java, Jatim, Sumatra, Bangka, Borneo, Sulawesi.

It is a national multi-ethnic church, scattered over 25 out of the 32 provinces of Indonesia.

According to the recent statistics the church is growing rapidly, has 1,305,000 adherents and members.