William Lyall may refer to:
- William Lyall (politician), Australian politician, member of the Victorian Legislative Assembly
- William Lyall (priest), English churchman
- William Lyall (businessman) Scottish–American merchant and businessman
- William John Campbell Lyall, Scottish rugby union player
- Bill Lyall, Canadian politician, member of the Northwest Territories Legislative Assembly
- Billy Lyall, Scottish musician
This disambiguation page lists articles about people with the same name.
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