Gonzalo Villanueva (born 13 January 1995) is an Argentine professional tennis player. He has a career-high ATP singles ranking of No. 268 achieved on 10 October 2022 and a best doubles ranking of No. 164 achieved on 1 December 2025.
Villanueva made his ATP main draw debut at the 2022 Los Cabos Open after entering the singles main draw as a lucky loser losing to Rinky Hijikata in qualifying. He won his maiden ATP Challenger title at the 2024 Challenger Tucumán in doubles partnering Luís Britto.