Ian Barnes may refer to:
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Ian Barnes (rugby union) (born 1948), Scottish rugby union player
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Ian Barnes (biologist)
Ian Barnes (born in Chadwell Heath in 1972) is an evolutionary geneticist notable for his work on ancient DNA, human and animal migration, and phylogenetics. Barnes is a Research Leader in the Department of Earth Sciences at the Natural History ...
(born 1972), British biologist
{{hndis, Barnes, Ian