Singles
2023 Nonthaburi Challenger II
Final
Champion	Arthur Cazaux
Runner-up	Lloyd Harris
Score	7–6(7–5), 6–2
Events
Singles Doubles
← 2023 · Nonthaburi Challenger · 2023 →

Dennis Novak was the defending champion^[1] but lost in the semifinals to Arthur Cazaux.

Cazaux won the title after defeating Lloyd Harris 7–6^(7–5), 6–2 in the final.

	Semifinals							Final
	1	Dennis Novak	4	6	2
	Q	Arthur Cazaux	6	4	6
								Q	Arthur Cazaux	77	6
								2	Lloyd Harris	65	2
	Q	Jason Jung	1	4
	2	Lloyd Harris	6	6

	First round							Second round							Quarterfinals							Semifinals
	1	D Novak	6	79
	Q	H Squire	3	67				1	D Novak	6	6
		V Royer	6	0					V Royer	2	3
	Alt	B Harris	1	0r											1	D Novak	6	6
		M Gengel	6	6												M Gengel	3	3
		H Moriya	1	2					M Gengel	2	77	7
	WC	P Kovapitukted	1	3				5	M Geerts	6	60	5
	5	M Geerts	6	6																		1	D Novak	4	6	2
	4	Z Kolář	3	3																		Q	A Cazaux	6	4	6
	Alt	P Gunneswaran	6	6				Alt	P Gunneswaran	77	64	3
	Q	G Fonio	4	4				Q	A Cazaux	65	77	6
	Q	A Cazaux	6	6											Q	A Cazaux	6	6
		B Hassan	7	7											8	T Sandgren	3	3
	Q	Alafia Ayeni	5	5					B Hassan	3	6	66
		D Added	6	62	4			8	T Sandgren	6	1	78
	8	T Sandgren	2	77	6

	First round							Second round							Quarterfinals							Semifinals
	7	S Shimabukuro	4	1
	Q	J Jung	6	6				Q	J Jung	6	77
		B Zhukayev	77	77					B Zhukayev	4	63
	WC	W Trongcharoenchaikul	62	65											Q	J Jung	4	7	6
		D Yevseyev	4	61											Q	E Donskoy	6	5	3
	Q	E Donskoy	6	77				Q	E Donskoy	6	77
		Y Uchiyama	6	6					Y Uchiyama	4	63
	3	K Żuk	2	1																		Q	J Jung	1	4
	6	D Michalski	3	7	6																	2	L Harris	6	6
		S Mochizuki	6	5	3			6	D Michalski	77	710
		S Travaglia	65	7	6				S Travaglia	64	68
		A Arnaboldi	77	5	3										6	D Michalski	4	3
		M Sasikumar	4	4											2	L Harris	6	6
		M Moraing	6	6					M Moraing	1	3
	WC	K Samrej	1	2				2	L Harris	6	6
	2	L Harris	6	6

• Main draw
• Qualifying draw