William Leach may refer to:
- William Elford Leach (1791–1836), English zoologist and marine biologist
- William Leach (politician) (1870–1949), British Labour Party politician, minister in the first Labour government
- William Turnbull Leach (1805–1886), Canadian clergyman and academic
- William Leach (canoeist) (born 1946), American sprint canoer
- William Leach (cricketer, born 1851) (1851–1932), English cricketer
- William Leach (cricketer, born 1883) (1883–1969), English cricketer
- William Leach (Canadian Army officer) (1942–2015)
- William Leach (historian), American historian
This disambiguation page lists articles about people with the same name.
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