Dr Alexander Scott FRS FRSE PCS (28 December 1853–10 March 1947) was a 19th/20th century Scottish chemist who served as Director of Scientific Research at the British Museum. He was President of the Chemical Society from 1915 to 1917. He determined the atomic weights of several elements: potassium (1879), sodium (1879), manganese (1881), carbon -re-evaluation (1897), tellurium (1902), nitrogen (1905).