Alexander Robertus Todd, Baron Todd (1907 nî 10 goe̍h 2 ji̍t – 1997 nî 1 goe̍h 10 ji̍t) sī chi̍t ūi Eng-kok ê hòa-ha̍k-ka. I mā-sī 1957 nî Nobel Hòa-ha̍k Chióng ê ti̍t-chióng-jîn; i ti̍t-chióng ê lí-iû sī for his work on nucleotides and nucleotide co-enzymes.

Alexander R. Todd, Baron Todd