Prince William of Saxe-Gotha-Altenburg (German: Wilhelm Carl Christian von Sachsen-Gotha-Altenburg; 12 March 1701, Gotha - 31 May 1771, Tonna) was a German prince of the Saxe-Gotha-Altenburg house, a junior line of the Ernestine Wettins.
He served as a Generalfeldzeugmeister in the armies of the Holy Roman Empire.