Prince Wilhelm of Urach, Count of Württemberg, 2nd Duke of Urach (Wilhelm Karl Florestan Gero Crescentius; German Fürst Wilhelm von Urach, Graf von Württemberg, 2. Herzog von Urach; 30 May 1864 – 24 March 1928) was a German prince who was elected King of Lithuania with the regnal name Mindaugas II on 11 July 1918. He never assumed the crown however, as German authorities declared the election invalid and the invitation was withdrawn in November 1918. From 17 July 1869 until his death he was head of the morganatic Urach branch of the House of Württemberg.