William Mortlock may refer to:
- Will Mortlock (1832–1884), English professional cricketer — active 1851 to 1870
- William Ranson Mortlock (1821–1884), pioneer grazier and politician in colonial South Australia
- William Tennant Mortlock (1858–1913), grazier and politician in South Australia (grandson of William Ranson Mortlock)
This disambiguation page lists articles about people with the same name.
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