Llewellin is a surname. Notable people with the surname include:
- David Llewellin (born 1960), Welsh rally driver
- John 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
See also
edit- Llewellin Setter, strain of English setters bred by R.L. Purcell Llewellin to be perfect for foot hunting and early field trials
- Llewelen
- Llywelyn