Anabaptist theology, also known as Anabaptist doctrine, is a theological tradition reflecting the doctrine of the Anabaptist Churches. The major branches of Anabaptist Christianity agree on core doctrines but have nuances in practice. While the adherence to doctrine is important in Anabaptist Christianity, living righteously is stressed to a greater degree.

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.