2021 NÖ Open – Singles

This was the first edition of the tournament.

Mats Moraing won the title after defeating Hugo Gaston 6–2, 6–1 in the final.

Seeds
• # 🇮🇹 Marco Cecchinato (first round)

• # 🇨🇿 Jiří Veselý (semifinals)

• # 🇧🇷 Thiago Monteiro (quarterfinals)

• # 🇵🇱 Kamil Majchrzak (semifinals)

• # 🇸🇰 Jozef Kovalík (second round)

• # 🇧🇦 Damir Džumhur (first round)

• # 🇦🇹 Dennis Novak (quarterfinals)

• # 🇫🇷 Hugo Gaston (final)