American linguist who was a principal authority on Vulgar Latin. He was also noted for his scholarship on Dante.

Grandgent was a professor at Harvard University from 1896 to 1932, lecturing on Dante as well as on Romance linguistics and phonetics. In addition to French and Italian grammars and a work on Old Provençal, he wrote an important Introduction to Vulgar Latin (1907) and From Latin to Italian: An Historical Outline of the Phonology and Morphology of the Italian Language (1927). In the area of Dante scholarship, Grandgent produced an edition of Dante's Divina Commedia (1909) among other works.