Llewellin may refer to:
- David Llewellin (born 1960), Welsh rally driver
- John Jestyn Llewellin, 1st Baron Llewellin GBE, PC, MC, TD (1893–1957), British army officer, Conservative Party politician
- Llewelyn Llewellin (died 1878), the first Dean of St David's Cathedral
- Philip Llewellin (1940–2005), British journalist and writer
- Richard Llewellin (born 1938), retired Anglican bishop in the Church of England
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