Giovanni Leone Reggio (12 December 1888 – 22 December 1971) was an Italian sailor who competed in the 1928 Summer Olympics, 1936 Summer Olympics, and 1948 Summer Olympics. In 1928 he finished seventh as a crew member of the Italian boat Twins II in the 6 metre class event. Eight years later he was a crew member of the Italian boat Italia which won the gold medal in the 8 metre class competition. In 1948 he finished eighth as a crew member of the Italian boat Ciocca II in the 6 metre class event.

• Giovanni Reggio at databaseOlympics.com (archived)
• Evans, Hilary; Gjerde, Arild; Heijmans, Jeroen; Mallon, Bill; et al. "Giovanni Leone Reggio". Olympics at Sports-Reference.com. Sports Reference LLC. Archived from the original on 2 April 2015. Retrieved 18 March 2015.

• Giovanni Leone Reggio at World Sailing
• Giovanni Leone Reggio at Olympics.com
• Giovanni Leone Reggio at Olympedia