Other
- Llewellyn Baronets
- Llewellyn Worldwide, New Age and Occult publishing house
- John Llewellyn Rhys Prize, British based literary prize initiated in 1942
- Jon Llewellyn Kyl, United States Senator (R) from Arizona
- Lloyd Llewellyn, comic book series by Daniel Clowes
- Llywelyn's coronet, crown seized by Edward I in 1284
- Officer Francis Llewellyn 'Ponch' Poncherello, fictional character on the U.S. television series CHiPs
- Llewelyn, a young archer in Valkyrie Profile
- Llewellin Setter, a field dog bred from the English Setter by Englishman R. Purcell Llewellin (1840–1925)
- HMS Llewellyn, the name of two ships of the Royal Navy
- "Llewellyn", a song on the album Marin County Line, by New Riders Of The Purple Sage
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