The Sporkenburg is a late medieval castle ruin about one kilometre south of Eitelborn in the district of Westerwaldkreis in the German state of Rhineland-Palatinate.

The ruins of the spur castle lie within the parish of the village of Eitelborn in the Westerwald hills above the L 329 between Bad Ems and Arzbach.

The easiest option is to follow the signs along the castle path (Burgweg) into the woods from the eastern exit of the village of Eitelborn aus (Erlenweg, near the cemetery).

The tower castle (Turmburg) is located on a roughly rectangular hill spur above the stream of Emsbach.

On the north side the castle has a five-storey, slightly angled shield wall, reinforced with bartizans, that has a height of almost 20 metres.

In the late 13th century the settlement is recorded as a fief in the possession of Emmerich of Andernach and Henry of Lahnstein.