Crellin is a surname of Manx origin. Notable people with the surname include:
- Benjamin Crellin, New Zealand comedian, actor and writer
- Bertie Crellin (1902–1993), Australian rules footballer
- Billy Crellin (born 2000), British footballer
- David Crellin (born 1961), British actor
- Jeffrey Crellin, Australian oboist
- John Crellin, Manx politician
- Max Crellin (born 1933), Australian politician
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