Giovanni Frattini (born 24 Octobber 2002) is an Italian javelin thrower. He is a two-time Italian champion and won the silver medal at the 2025 European Throwing Cup.
From Romagna, Frattini is coached by Emanuele Verni. Frattini won the under-23 javelin competition at the 2024 European Throwing Cup in Leiria, Portugal. In June, he won the senior Italian Athletics Championships with a throw of 75.40 metres. He threw a personal best of 83.61 metres at the Italian Club Championships in Modena in September 2024, to move to second on the Italian all-time list, behind only Carlo Sonego. It was a personal best of close to six metres.
Frattini won the silver medal at the 2025 European Throwing Cup in Nicosia, Cyprus, with a throw of 82.78 metres. In August 2025, he won the Italian Athletics Championships ahead of Michele Fina with a throw of 74.85 metres. He was a finalist at the 2025 Summer World University Games in Germany, with a best throw of 74.97 metres.