In 1875, the Alliance of Reformed Churches that maintains the Presbyterian System (ARCPS) was organized in London.

In 1970, ARCPS and ICC formed the World Alliance of Reformed Churches (WARC).

[5][6][7] In the following years, ICRC grew, bringing together conservative Reformed denominations from around the world.

[28] In 2023, a presbytery of the Presbyterian Church in America requested that the denomination apply for ICRC membership; the General Assembly referred this overture to its permanent Interchurch Relations Committee.

[6][30][8] In 2017, the Reformed Churches in the Netherlands (Liberated) began to allow women's ordination, which is completely rejected by the other members of the organization.

[31] However, the Liberated Reformed Churches did not respond to the ICRC's request and continued to ordain women.