Singles
2023 NÖ Open
Final
Champion	Vít Kopřiva
Runner-up	Sumit Nagal
Score	6–2, 6–4
Events
Singles Doubles
← 2022 · NÖ Open · 2024 →

Jozef Kovalík was the defending champion^[1] 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.

	Semifinals							Final
		Sumit Nagal	6	6
	4	Flavio Cobolli	3	4
									Sumit Nagal	2	4
									Vít Kopřiva	6	6
	3	Maximilian Marterer	3	3
		Vít Kopřiva	6	6

	First round							Second round							Quarterfinals							Semifinals
	1	A Ramos Viñolas	6	77
		F Misolic	4	62				1	A Ramos Viñolas	6	6
	WC	Sandro Kopp	3	4				Q	G Melzer	3	2
	Q	G Melzer	6	6											1	A Ramos Viñolas	66	3
		S Nagal	6	6												S Nagal	78	6
	Q	D Masur	1	2					S Nagal	77	3	6
		L Neumayer	62	61				8	V Sachko	62	6	3
	8	V Sachko	77	77																			S Nagal	6	6
	4	F Cobolli	6	7																		4	F Cobolli	3	4
		J Sels	3	5				4	F Cobolli	5
	Q	Jeremy Jahn	77	4	64				H Laaksonen	0r
		H Laaksonen	65	6	77										4	F Cobolli	6	6
	WC	N Oberleitner	64	6	3											H Squire	1	2
	WC	L Miedler	77	2	6			WC	L Miedler	6	3	4
		H Squire	63	6	6				H Squire	4	6	6
	5	J Kovalík	77	2	4

	First round							Second round							Quarterfinals							Semifinals
	6	I Gakhov	7	6
	Q	B Hassan	5	4				6	I Gakhov	77	4	64
		R Molleker	5	4					S Rodríguez Taverna	64	6	77
		S Rodríguez Taverna	7	6												S Rodríguez Taverna	6	4	61
		Timo Stodder	1	6	6										3	M Marterer	4	6	77
		S Diez	6	2	1				T Stodder	69	1
	Q	L Rosol	4	6	3			3	M Marterer	711	6
	3	M Marterer	6	3	6																	3	M Marterer	3	3
	7	D Svrčina	1	6	6																		V Kopřiva	6	6
	Q	M Möller	6	4	1			7	D Svrčina	6	4	2
		D Kuzmanov	63	6	7				D Kuzmanov	2	6	6
		D Novak	77	2	5											D Kuzmanov	1	1
		V Kopřiva	6	77												V Kopřiva	6	6
		Z Kolář	2	64					V Kopřiva	7	2	6
		Elmar Ejupovic	64	6	4			2	J Rodionov	5	6	4
	2	J Rodionov	77	2	6

• Main draw
• Qualifying draw