| 2021 Antalya Challenger III | |
|---|---|
| Date | 29 November – 5 December |
| Edition | 3rd |
| Surface | Clay |
| Location | Antalya, Turkey |
| Champions | |
| Singles | |
 Nuno Borges | |
| Doubles | |
 Riccardo Bonadio / Giovanni Fonio | |
The 2021 Antalya Challenger III 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 Antalya, Turkey between 29 November and 5 December 2021.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 TUR | Cem İlkel | 145 | 1 |
 IND | Ramkumar Ramanathan | 222 | 2 |
| POR | João Domingues | 245 | 3 |
 CRO | Duje Ajduković | 247 | 4 |
 TPE | Tseng Chun-hsin | 251 | 5 |
| POR | Nuno Borges | 262 | 6 |
 FRA | Geoffrey Blancaneaux | 280 | 7 |
| POR | Gonçalo Oliveira | 288 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry into the singles main draw as alternates:
The following players received entry from the qualifying draw:
Tiago Cação 
Oliver Crawford
Mick Veldheer
Louis Wessels Nuno Borges def. 
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