William Ely (1765–1817) was an American politician.
William Ely may also refer to:
William of Ely (fl. 1196–1215), English churchman William Ely (divine) (fl. 1609), English divine Bill Ely (1869–1957), Australian politician William H. J. Ely (1891–1942), American jurist and politician William J. Ely (1911–2017), American Army general Bones Ely (William Frederick Ely, 1863–1952), baseball player