Giovanni Fonio (born 7 May 1998) is an Italian tennis player.

Fonio has a career high ATP singles ranking of 274 achieved on 4 December 2023.

[1] Fonio has won 2 ATP Challenger doubles title: at the 2023 Internazionali di Tennis del Friuli Venezia Giulia with Francesco Forti and at the 2021 Antalya Challenger III with Riccardo Bonadio.

I'm the Yokkaichi Challenger in Japan, on 30 November 2023, he beat the then top 100 player Yosuke Watanuki in 3 sets (3-6 / 6-2 / 7-5).

[3] This biographical article relating to Italian tennis is a stub.