The 2023 IBG Prague Open was a professional tennis tournament played on clay courts. It was part of the 2023 ATP Challenger Tour. It took place in Prague, Czech Republic between 21 and 26 August 2023.

Country	Player	Rank1	Seed
AUT	Lukas Neumayer	223	1
ITA	Francesco Maestrelli	246	2
ITA	Luciano Darderi	250	3
GER	Rudolf Molleker	266	4
POR	João Sousa	270	5
GER	Henri Squire	276	6
FRA	Mathias Bourgue	277	7
MON	Valentin Vacherot	286	8

• ¹ Rankings as of 14 August 2023.^[1]

The following players received wildcards into the singles main draw:

• Hynek Bartoň
• Jonáš Forejtek
• Toby Kodat

The following player received entry into the singles main draw using a protected ranking:

• Carlos López Montagud

The following players received entry from the qualifying draw:

• Paweł Ciaś
• Gabriel Debru
• Federico Agustín Gómez
• Kirill Kivattsev
• Jakub Nicod
• Michael Vrbenský

• Rudolf Molleker def. Gabriel Debru 6–2, 6–2.

• Petr Nouza / Andrew Paulson def. Filip Bergevi / Mick Veldheer 7–5, 6–3.