William Louis (7 January 1647 – 23 June 1677) was Duke of Württemberg from 1674 until his death in 1677.

[1] William Louis was born in Stuttgart, the ninth child of Eberhard III, Duke of Württemberg, and his first wife Anna Catharina of Salm-Kyrburg.

At the age of 30, the Duke died unexpectedly of a heart attack at the stop-over in Schloß Hirsau.

His widow Magdalena Sibylla became regent of Württemberg between 1677 and 1693, until her son reached adulthood.

He married on 6 November 1673 in Darmstadt with Magdalena Sibylla of Hesse-Darmstadt, and had 4 children: This article about a member of the German nobility is a stub.