Diu Crône (English: The Crown) is a Middle High German poem of about 30,000 lines treating of King Arthur and the Matter of Britain, dating from around the 1220s and attributed to the epic poet Heinrich von dem Türlin.

Diu Crône also tells of the Knights of the Round Table's quest for the Grail but differs from the better-known "Percival" and "Galahad" versions of the narrative in that it is here Gawain who achieves the sacred object; it is the only work in the Arthurian corpus in which he does so.

The character in Diu Crône corresponding to Cu Roi (and thus also to the Green Knight of later tradition) is the 'learned clerk' Gansguoter, likewise a magician and shape-shifter.

Noteworthy among these archaic episodes is that (lines 12611-13934) concerning the contention between two sisters for the bridle that confers mastery of a magic mule with the power to transport its rider in safety through terrors to an otherworldly, revolving castle adorned with severed human heads (Celts 6.1 and Headhunting 3.1).

This is also to be found in the more condensed and cryptic form in the short poem La Mule sans frein by Paien de Maisieres (Sir Gawain and the Carle of Carlisle 7.3).