William McEwan or William MacEwan may refer to:

William McEwan (1827–1913), Scottish brewer and politician William Barker McEwan (1870–1933), New Zealand librarian Bill McEwan, Canadian businessman Bill McEwan (rugby union), Scottish rugby player Willie McEwan (golfer) (1872–1931), Scottish golfer

See also Sir William Macewen (1848–1924), Scottish surgeon and neuroscientist