Osterrath is the family name of a stained glass workshop operating from Tilff, Belgium beginning in the final part of the 19th century. Their works were in the neo-gothic style of the period and samples or their works can be seen in cathedrals in Liège, Belgium and in many religious constructions in surrounding cities in Europe. Stained glass panels meant for religious buildings were sent as far as the United States and Canada. The Musée des arts religieux et mosans in Liège holds further documentation of the family's creations.