Roger of Helmarshausen (fl. 12th century) was a well-known goldsmith and metalwork artist, and also a Benedictine monk.
Roger is first heard of in connection with Stavelot Abbey in the Meuse valley, a centre of Mosan art, and especially goldsmith's work. He worked between 1100 and 1107 in St. Pantaleon's church in Cologne. At least two portable altars made by him are in the treasury of Paderborn Cathedral. In 1107 he moved to Helmarshausen Abbey, where he established a goldsmith's workshop. In conjunction with the scriptorium he produced several important works in the Romanesque style, including various illuminated codices, above all the Gospels of Henry the Lion, as well as many pieces of jewellery.
It has been suggested, principally by the German academic Eckhard Freise, that Roger is identical with Theophilus Presbyter, author of the medieval treatise De diversis artibus (also Schedula diversarum artium) on applied arts and in particular, metalwork. This identification is not universally accepted.