Sir James Walker FRS[1] FRSE FCS LLD (6 April 1863 – 6 May 1935) was a Scottish chemist.[2] He worked mainly on inorganic and physical chemistry. His major contribution was in the study of chemical reaction kinetics based on a study of the reactions converting ammonium cyanate to urea which was published in 1895 along with Frederick J. Hambly (1878-1960).[3]