Caro Benigno Massalongo (25 March 1852, Verona – 18 March 1928, Verona) was an Italian botanist who specialized in the field of hepatocology. He was the son of paleontologist Abramo Bartolommeo Massalongo (1824-1860).
He studied botany at the University of Padua, receiving his PhD in 1873. In 1878 he was named professor of botany at the University of Ferrara. He was the author of 264 botanical publications. He was among the first to conduct systematic and scientific studies of plant galls.