Peter Dennis Mitchell (1920 nî 9 goe̍h 29 ji̍t – 1992 nî 4 goe̍h 10 ji̍t) sī chi̍t ūi Eng-kok ê hòa-ha̍k-ka. I mā-sī 1978 nî Nobel Hòa-ha̍k Chióng ê ti̍t-chióng-jîn; i ti̍t-chióng ê lí-iû sī for his contribution to the understanding of biological energy transfer through the formulation of the chemiosmotic theory.