Mar's Wark is a ruined building in Stirling built 1570–1572 by John Erskine, Regent of Scotland and Earl of Mar, and now in the care of Historic Scotland. Mar intended the building for the principal residence of the Erskine family in Stirling, whose chief had become hereditary keeper of the nearby royal Stirling Castle where the princes of Scotland were schooled. The house was known as "Mar's Lodging."