Diego Fabbri (July 2, 1911 – August 14, 1980) was an Italian playwright whose plays centered on religious (Catholic) themes.

Fabbri graduated from the University of Bologna in 1936 with a degree in economics and business. But his writing career had begun well before that. His first play, The Flowers of Pain, was published in 1928. He followed it with The Node, which was banned by the fascist government.