Gideon John Davies (born 6 July 1964) FRS FRSC FMedSci is a Professor of Chemistry in the Structural Biology Laboratory (YSBL) at the University of York, UK. Davies is best known for his ground-breaking studies into carbohydrate-active enzymes, notably analysing the conformational and mechanistic basis for catalysis and applying this for societal benefit. In 2016 Davies was apppointed the Royal Society Ken Murray Research Professor at the University of York.