A kapp (/kɒp/, Pennsylvania German from German Kappe meaning cap, cover, hood) is a Christian headcovering worn by many women of certain Anabaptist Christian denominations (especially among Amish, Mennonites, Schwarzenau Brethren and River Brethren of the Old Order Anabaptist and Conservative Anabaptist traditions), as well as certain Conservative Friends and Plain Catholics, in obedience to Paul the Apostle's command in 1 Corinthians 11:2–10.
Primitive forms of the kapp are seen in the depictions of early Christian women as portrayed in the "etchings in the Catacomb of Domitila in Rome—dating as far back as A.D. 95". The 12th century Waldensians wore the kapp in France and Italy, as did the early Anabaptists of the 16th century—a practice continued down to the present-day by Old Order Anabaptists and Conservative Anabaptists.