The Reformed Church of Pakistan began as a single congregation, the Sutlej Reformed Presbyterian Church, under the evangelistic and pastoral ministry of indigenous missionary Pastor Arslan Ul Haq in 2011 in Bahawalpur. It was founded in response to the need for a strongly scriptural, evangelical, and Reformed witness to Christ in Pakistan. Pastor Arslan extended the hand of fellowship to other independent evangelical pastors, some of whom were graduates of various Bible colleges and seminaries, while others had no theological training. To fulfill this need, Pastor Arslan started Biblical and Theological seminars, workshops, and mission trips within Pakistan. As a result, the work of the kingdom expanded, new pastors began to fellowship with Pastor Arslan Ul Haq, and a denomination was formed.
Since 2015, the Reformed Church of Pakistan has successfully ordained numerous dedicated men, established multiple congregations across Pakistan, and welcomed several congregations into its fold.