Gian Marco Moroni (born 13 February 1998) is an Italian professional tennis player. Moroni has a career-high ATP singles ranking of world No. 159, which he first achieved in June 2022. He also has a career-high ATP doubles ranking of world No. 327, attained in May 2019. He has reached seven career singles finals, with a record of two wins and five losses, including a 1–4 record in ATP Challenger finals. Additionally, he has reached one career doubles final, in which he finished runner-up, at the ITF Futures level.