The Mennonite Church USA is an Anabaptist Christian denomination in the United States. Although the organization is a recent 2002 merger of the Mennonite Church and the General Conference Mennonite Church, the body has roots in the Radical Reformation of the 16th century.

Anabaptism is a Christian movement which traces its origins to the Radical Reformation in the 16th century. Anabaptists believe that baptism is valid only when candidates freely confess their faith in Christ and request to be baptized. Commonly referred to as believer's baptism, it is opposed to baptism of infants, who are not able to make a conscious decision to be baptized.