Abstract
Of eighty-nine churches that belong to the Communion of Churches in Indonesia, forty-eight of them, located from Sumatra to Papua, declare themselves to be Calvinist or Reformed. Calvinist communions are the largest of the Protestant denominations in Indonesia. This article illustrates how Calvinist thinking entered Indonesia and what kind of Calvinism is found in the Indonesian churches to the present. In theology and practice, these churches with their Calvinist background continue to keep the Calvinist or Reformed tradition alive.