John Griffith Vaughan (5 May 1926 – 17 May 2005) was a Welsh food scientist. He was an expert in seed science, whose work linked the fields of botany and nutrition.
During nearly 40 years at the University of London, Vaughan pioneered new techniques for the study of seed proteins, became the leading expert on the structure and composition of oilseeds such as oilseed rape, and was widely consulted by industry. His expertise in identifying plant parts in animal and human foods was much sought after by flour millers and other food processors.