| 2021 Braga Open | |
|---|---|
| Date | 20–26 September |
| Edition | 3rd |
| Draw | 32S / 16D |
| Surface | Clay |
| Location | Braga, Portugal |
| Champions | |
| Singles | |
 Thiago Monteiro | |
| Doubles | |
 Nuno Borges / Francisco Cabral | |
The 2021 Braga Open was a professional tennis tournament played on clay courts. It was the third edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Braga, Portugal between 20 and 26 September 2021.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| BRA | Thiago Monteiro | 92 | 1 |
 JPN | Taro Daniel | 112 | 2 |
 FRA | Hugo Gaston | 118 | 3 |
 SRB | Nikola Milojević | 152 | 4 |
 GER | Cedrik-Marcel Stebe | 168 | 5 |
 ITA | Alessandro Giannessi | 174 | 6 |
| POR | Frederico Ferreira Silva | 184 | 7 |
 CAN | Steven Diez | 203 | 8 |
The following players received wildcards into the singles main draw:
Pedro Araújo Tiago Cação Luís FariaThe following players received entry into the singles main draw using protected rankings:
The following players received entry from the qualifying draw:
The following player received entry as a lucky loser:
Thiago Monteiro def. Nikola Milojević 7–5, 7–5. Nuno Borges / Francisco Cabral def. 
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