Johannes Sixtus Gerhardus (Jan) Verkade (18 September 1868 - 19 July 1946), afterwards Willibrord Verkade O.S.B., was a Dutch Post-Impressionist and Christian Symbolist painter.
He entered the Archabbey of Beuron and continued his work in a religious context, working closely with Desiderius Lenz, leader of the Beuron Art School.
He worked throughout Europe and had an important influence on the continuing development of the new Benedictine Art.