Giannelli is an Italian surname. Notable people with the surname include:
Alessandro Giannelli (born 1963), Italian former racing cyclist Fred Giannelli (born 1960), American electronic musician Mario Giannelli (1920–2003,nicknamed "Yo-Yo"), American football guard in the National Football League Paul Giannelli (born 1945), American lawyer, consultant and law professor Pietro Giannelli (1807–1881), Italian cardinal Ray Giannelli (born 1966), former American Major League Baseball third baseman Sean Giannelli (born 1996), Malaysian football player Simone Giannelli (born 1996), Italian volleyball player
See also Giannelli Imbula, (born 1992), French professional footballer