William McCormick
William McCormick may refer to:
- William McCormick (diplomat), American diplomat
- William McCormick (businessman), Scottish-born merchant in North Carolina
- William McCormick (Upper Canada politician), Canadian businessman, author and politician
- William McCormick (MP), Conservative Londonderry City MP
- William E. McCormick, American lawyer, businessman, and politician from New York
- William Grigsby McCormick, American businessman
- William Sanderson McCormick, businessman from Virginia operated reaper business in Chicago
- William McCormick (literary scholar), Scottish-born scholar and educational administrator
- Barry McCormick, American baseball player
- Bill McCormick (Canadian football), Canadian football player
- Fergie McCormick, New Zealand rugby player
- William McCormick (physician), Canadian physician and nutritionist