William Penney (disambiguation)
William Penney, Baron Penney (1909–1991) was an English mathematician.
William Penney may also refer to:
- William Penney, Lord Kinloch (1801–1872), Scottish judge
- William F. Penney (1862–1934), Newfoundland judge and politician
See also
- William Penny (1809–1892), Scottish whaling captain and explorer
- Will Penny, 1968 western film