Otto Paul Hermann Diels (1876 nî 1 goe̍h 23 ji̍t – 1954 nî 3 goe̍h 7 ji̍t) sī chi̍t ūi Tek-kok ê hòa-ha̍k-ka. I mā-sī 1950 nî Nobel Hòa-ha̍k Chióng ê ti̍t-chióng-jîn; i ti̍t-chióng ê lí-iû sī for their discovery and development of the diene synthesis.

Otto Diels