Giovanni De Gennaro (born 21 July 1992) is an Italian slalom canoeist who has competed at the international level since 2008, specializing in K1 and kayak cross. He is a three time Olympian and an Olympic champion in the K1 event from the 2024 Summer Olympics.
De Gennaro has competed at three Olympic Games. In his first Olympic participation he finished 7th in the K1 event at the 2016 Summer Olympics in Rio de Janeiro. He then finished 14th in the K1 event at the delayed 2020 Summer Olympics in Tokyo after being eliminated in the semifinal. He then went on to win the gold medal in the K1 event at the 2024 Summer Olympics in Paris, where he also finished 13th in kayak cross.
De Gennaro won three medals at the ICF Canoe Slalom World Championships with a gold (K1 team: 2013) a silver (K1: 2022) and a bronze (K1 team: 2011).
He also won four medals (1 gold, 2 silvers and 1 bronze) at the European Championships.
De Gennaro lives in Roncadelle (Brescia) and he was a member of Corpo Forestale dello Stato, now Carabinieri. His brother Riccardo is a former slalom canoeist. Slalom canoeist Stefanie Horn is Giovanni's sister-in-law.