威廉·泰尔（德语：Wilhelm Tell、法语：Guillaume Tell、意大利语：Guglielmo Tell）是瑞士传说中的英雄，14世纪居住于乌里州。

威廉·泰尔是乌里州的一个农民，哈布斯堡王朝在当地实行暴政，新任总督葛斯勒在中央广场竖立柱子，在柱顶挂着奥地利皇家帽子，并规定居民经过时必须向帽子敬礼，违者将遭到重罚。当时泰尔因没有向帽子敬礼而被捕，葛斯勒要泰尔射中放在泰尔儿子头上的苹果才释放他们，否则两人都会被罚，结果泰尔成功射中苹果。第二箭瞄准葛斯勒总督，但泰尔并没有射出箭。当时泰尔回答：「如果我射中儿子，那么第二箭会射中总督心脏。」总督大怒，将泰尔父子囚禁起来。

William Tell (in the four languages of Switzerland: German:Wilhelm Tell; French:Guillaume Tell; Italian:Guglielmo Tell; Romansh:Guglielm Tell) is a folk hero of Switzerland. His legend is recorded in a late 15th-century Swiss illustrated chronicle. It is set in the time of the original foundation of the Old Swiss Confederacy in the early 14th century. According to the legend, Tell—an expert marksman with the crossbow—assassinated Gessler, a tyrannical reeve of Habsburg Austria positioned in Altdorf, Uri.