Reformed Baptists generally adhere to the 1689 Baptist Confession of Faith, which is also known as the Second London Confession of Faith. This Confession is a Reformed Baptist statement of beliefs, modeled after the Westminster Confession of Faith, which was originally formulated by the English Parliament in the mid-17th century.

The 1689 Baptist Confession of Faith has been adopted by many Reformed Baptist churches and denominations and is considered an important statement of faith for those who adhere to this tradition.

It is worth noting that while the 1689 Baptist Confession of Faith is an important source of doctrine and belief for Reformed Baptists, it is not the only source of authority or interpretation for these believers. Each individual congregation and denomination may have its own distinct practices, customs, and interpretations of scripture, which may vary within the broader framework of the Reformed Baptist tradition.