The 2023 Saint-Tropez Open was a professional tennis tournament played on hard courts. It was the third edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Saint-Tropez, France between 18 and 24 September 2023.

Country	Player	Rank1	Seed
FRA	Ugo Humbert	36	1
AUT	Sebastian Ofner	59	2
FRA	Grégoire Barrère	62	3
FRA	Richard Gasquet	65	4
USA	Michael Mmoh	81	5
FRA	Hugo Gaston	87	6
BEL	David Goffin	100	7
FRA	Benjamin Bonzi	102	8
GBR	Liam Broady	104	9

• ¹ Rankings are as of 11 September 2023.^[1]

The following players received wildcards into the singles main draw:

• Ugo Blanchet
• Arthur Géa
• Ugo Humbert

The following players received entry into the singles main draw as alternates:

• Mattia Bellucci
• Harold Mayot

The following players received entry from the qualifying draw:

• Dan Added
• Peter Gojowczyk
• Billy Harris
• Oleksii Krutykh
• Mark Lajal
• Jules Marie

The following players received entry as lucky losers:

• Mathias Bourgue
• Eliakim Coulibaly
• Alexander Cozbinov
• Kyrian Jacquet

• Constant Lestienne def. Liam Broady 4–6, 6–3, 6–4.

• Dan Added / Albano Olivetti def. Jonathan Eysseric / Harold Mayot 3–6, 1–0 ret.