Haslett is a surname. Notable people with the surname include:
- Adam Haslett (born 1970), American fiction writer
- Alexander Haslett (1883–1951), Irish independent politician
- Caroline Haslett (1895–1957), British electrical engineer and electricity industry administrator
- Jim Haslett (born 1955), defensive coordinator of the Washington Redskins
- John F. Haslett (21st century), American writer
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