2023 Internazionali di Tennis Città di Trieste – Singles

Francesco Passaro was the defending champion but lost in the final to Hugo Gaston.

Gaston won the title after defeating Passaro 6–3, 5–7, 6–2 in the final.

Seeds
• # 🇭🇺 Fábián Marozsán (semifinals)

• # 🇪🇸 Pedro Martínez (semifinals)

• # Tomás Barrios Vera (first round)

• # 🇫🇷 Hugo Gaston (champion)

• # Alejandro Tabilo (withdrew)

• # 🇮🇹 Francesco Passaro (final)

• # 🇮🇹 Flavio Cobolli (second round)

• # 🇨🇿 Zdeněk Kolář (second round)