2023-10-23 Brest (c)

The 2023 Brest Challenger (known as Open Brest Crédit Agricole for sponsorship reasons) was a men's tennis tournament played on indoor hard courts in Brest, France, that was part of the Challenger 100 series of tournaments on the 2023 ATP Challenger Tour. It was the 8th edition of the Brest Challenger and was held 23–29 October.

On 1 March 2022, the ATP, WTA, ITF and the four grand slam tournaments announced as a result of the Russian war in Ukraine, Belarus and Russia would not be allowed to play in tournaments under the names or flags of their countries. The tennis players are able to compete in tournaments but not under the Russian or Belarusian flags.