Llewellyn-Jones is a surname, and may refer to:
Derek Llewellyn-Jones (1923–1997), Australian gynaecologist and medical author Frank Llewellyn-Jones (1907–1997), Welsh physicist and academic administrator Frederick Llewellyn-Jones (1866–1941), Welsh solicitor and politician Lloyd Llewellyn-Jones, Welsh ancient historian Rosie Llewellyn-Jones, British scholar Tony Llewellyn-Jones (born 1949), Australian actor