The RCA believes in Christian unity and expresses this belief by belonging to several "families" of churches. In 1996, General Synod unanimously adopted an Ecumenical Mandate for the Reformed Church in America. The Reformed Church is a member of the World Alliance of Reformed Churches and is a founding member of the World Council of Churches and the National Council of Churches of Christ in the U.S.A., and Christian Churches Together.
Additionally, the RCA has entered into a Formula of Agreement with the Evangelical Lutheran Church in America, the United Church of Christ, and the Presbyterian Church (USA).
The RCA also expresses unity by working in partnership with other denominations to publish resources, host training events, and coordinate special programs. The RCA's mission program operates through partnerships with other Christian churches and mission organizations.
Roman Catholic - Reformed Dialogue of the United States
In 1965, four denominations from the Reformed family of churches and representatives of the National Conference of Catholic Bishops launched an official conversation in the United States. The United Presbyterian Church (U.S.A.), the Presbyterian Church (U.S.), the Reformed Church in America (RCA), and the United Church of Christ (UCC) appointed a team of pastors, theologians, and lay members to initiate an ongoing consultation.
Today, the dialogue comprises the Presbyterian Church (U.S.A.), the UCC, the Christian Reformed Church in North America, the RCA, and representatives of the U.S. Catholic Bishops. Previous rounds of dialogue produced common statements on baptism and the Lord’s Supper. The most recent round, the eighth, focused on ecclesiology—particularly the roles of the Trinity, covenant, Word and sacrament, mission, and unity and diversity in the life of the church. The dialogue also examined ecclesial ministry and oversight and uncovered a unifying affirmation that these are undertaken personally and collegially in service to the church, not just for the church’s own sake, but for the sake of the world God loves. The report of the eighth round is summarized in the penultimate draft “The One Body of Christ: Ministry in Service to the Church and the World.” The ninth round of dialogue will commence in the fall of 2018 with a focus on the relationship between justification and justice. The prospectus can be found here.