2023 NÖ Open – Singles

Jozef Kovalík was the defending champion but lost in the first round to Henri Squire.

Vít Kopřiva won the title after defeating Sumit Nagal 6–2, 6–4 in the final.

Seeds
• # 🇪🇸 Albert Ramos Viñolas (quarterfinals)

• # 🇦🇹 Jurij Rodionov (second round)

• # 🇩🇪 Maximilian Marterer (semifinals)

• # 🇮🇹 Flavio Cobolli (semifinals)

• # 🇸🇰 Jozef Kovalík (first round)

• # Ivan Gakhov (second round)

• # 🇨🇿 Dalibor Svrčina (second round)

• # 🇺🇦 Vitaliy Sachko (second round)