| Date: | 23–29 October |
| Edition: | 8th |
| Surface: | Hard (Indoor) |
| Location: | Brest, France |
| Champs: |  Pedro Martínez |
| Champd: |  Yuki Bhambri /  Julian Cash |
The 2023 Brest Challenger was a professional tennis tournament played on hard courts. It was the eighth edition of the tournament which was part of the 2023 ATP Challenger Tour. It took place in Brest, France between 23 and 29 October 2023.
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
 France | Richard Gasquet | 62 | 1 | |
| Nuno Borges | 74 | 2 | ||
| Spain | Jaume Munar | 83 | 3 | |
| France | Benjamin Bonzi | 89 | 4 | |
| France | Constant Lestienne | 93 | 5 | |
| France | Hugo Gaston | 96 | 6 | |
| United Kingdom | Liam Broady | 100 | 7 | |
 Belgium | David Goffin | 105 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry into the singles main draw as special exempts:
The following players received entry from the qualifying draw:
The following players received entry as lucky losers:
See main article: 2023 Brest Challenger – Singles.
Pedro Martínez def. Benjamin Bonzi 7–6(8–6), 7–6(7–1).See main article: 2023 Brest Challenger – Doubles.
Yuki Bhambri / Julian Cash def. 
Robert Galloway / Albano Olivetti 6–7(5–7), 6–3, [10–5].
