The Hostarius (alternatively, Usher, Doorward or Durward) was an office in medieval Scotland. Its holders who eventually became hereditary, had the theoretical responsibility of guarding the king's door, thereby protecting the king's property. This is a list of hostarii.
The family of "Durward" (a later name for hostarius) may have held the office hereditarily after Thomas of Lundie, and certainly kept the title as a surname (in Norman French, l'Ussier ("the Usher"); in English, Durward). However, by the second half of the 13th century, the office was no longer hereditary. This led to many individuals serve as hostarii during this period. Unlike many other hereditary royal office holders, the "Durward" family were not of Anglo-Norman or French origin but native Gaelic origin. It was a sept of the native comital dynasty of Mar.