John Masson Gulland FRS FRSE FRIC (14 October 1898 – 26 October 1947) was a Scottish chemist and biochemist. His main work was on nucleic acids, morphine and aporphine alkaloids. His work at University College Nottingham on electrometric titration was important in leading to the discovery of the DNA double helix by James Watson and Francis Crick, and he was described as "a great nucleic acid chemist."[1] He established the Scottish Seaweed Research Association and the Lace Research Council.