The Communion of Churches in Indonesia (CCI), known as Persekutuan Gereja-Gereja di Indonesia (PGI) in Indonesian, is the largest organisation of Christian churches in Indonesia.

CCI/PGI acts on behalf of, and speaks for, more than 70 protestant churches, seeking to address national issues as they relate to Christians and their communities throughout Indonesia.

CCI/PGI is also involved in projects aimed at cultivating interfaith harmony and is dedicated to promoting the development of leadership skills in the churches throughout Indonesia.