David Llewellyn
David Llewellyn may refer to:
- David Llewellyn (Australian politician), member of the Parliament of Tasmania
- David Llewellyn (British politician), British Member of Parliament for Cardiff North, 1950–1959
- David Llewellyn (author), Welsh novelist
- David Llewellyn (golfer), Welsh golfer
- David Llewellyn (rugby union), Wales international rugby union player also known as Dai
- David Llewellyn (academic), Vice-Chancellor of Harper Adams University
- Sir David Llewellyn, 1st Baronet, Welsh industrialist and financier
- David Llewellyn (trade unionist), Welsh trade unionist and political activist
- Dai Llewellyn, socialite
- David Herbert Llewellyn, doctor who went down with the CSS Alabama
- David Llewellyn (footballer),, footballer with West Ham United and Peterborough United