Established by Columban V in the Decreta Columban V: XV, the Diocese of Icecrown was a See of the Church of the Holy Light which covered the land masses of Northrend that were north of a line extending from the coast along the southern borders of Zul'drak, Crystalsong Forest, Wintergrasp, and Icecrown. Hence it further contained, in addition to the areas aforementioned, Storm Peaks and Hrothgar's Landing.

The Diocese was subsumed into the Diocese of Icecrown in the Act 1 Caspius I c1.

The first and only Bishop of the Diocese of Icecrown was Eustasius Greenleaf, as established in Decreta Columban V: XVI.

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