| Doubles | |
|---|---|
| 2021 Antalya Challenger III | |
| Champions |  Riccardo Bonadio Giovanni Fonio |
| Runners-up |  Hsu Yu-hsiou Tseng Chun-hsin |
| Score | 3–6, 6–2, [12–10] |
Denys Molchanov and Aleksandr Nedovyesov were the defending champions [1] but chose not to defend their title.
Riccardo Bonadio and Giovanni Fonio won the title after defeating Hsu Yu-hsiou and Tseng Chun-hsin 3–6, 6–2, [12–10] in the final.
Gonçalo Oliveira / 
Bart Stevens (first round) Francisco Cabral / 
Aziz Dougaz (first round)
Javier Barranco Cosano / Oriol Roca Batalla (semifinals, withdrew)
Vladyslav Orlov / 
Ramkumar Ramanathan (semifinals)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | G Oliveira B Stevens | 3 | 2 | ||||||||||||||||||||||||
| R Bonadio G Fonio | 6 | 6 | R Bonadio G Fonio | 6 | 6 | ||||||||||||||||||||||
 D Ajduković  D-h Lee | 2 | 2 | E Esteve Lobato N Fatić | 2 | 3 | ||||||||||||||||||||||
| Eduard Esteve Lobato N Fatić | 6 | 6 | R Bonadio G Fonio | 77 | 6 | ||||||||||||||||||||||
| 4 | V Orlov R Ramanathan | 6 | 6 | 4 | V Orlov R Ramanathan | 64 | 4 | ||||||||||||||||||||
 FC Jianu N Sánchez Izqueirdo | 4 | 4 | 4 | V Orlov R Ramanathan | 6 | 7 | |||||||||||||||||||||
| WC |  Lucas Gerch A Metreveli | 6 | 1 | [10] | WC | L Gerch A Metreveli | 2 | 5 | |||||||||||||||||||
| WC |  M İlhan E Kırkın | 3 | 6 | [6] | R Bonadio G Fonio | 3 | 6 | [12] | |||||||||||||||||||
O Krutykh  D Svrčina | Y-h Hsu C-h Tseng | 6 | 2 | [10] | |||||||||||||||||||||||
 M Kalovelonis Pol Martín Tiffon | w/o | M Kalovelonis P Martín Tiffon | 66 | 4 | |||||||||||||||||||||||
| WC | S Ağabigün Y Erel | 3 | 6 | [5] | 3 | J Barranco Cosano O Roca Batalla | 78 | 6 | |||||||||||||||||||
| 3 | J Barranco Cosano O Roca Batalla | 6 | 3 | [10] | 3 | J Barranco Cosano O Roca Batalla | |||||||||||||||||||||
| T Altuna C İlkel | 2 | 0 | Y-h Hsu C-h Tseng | w/o | |||||||||||||||||||||||
| Y-h Hsu C-h Tseng | 6 | 6 | Y-h Hsu C-h Tseng | 6 | 3 | [11] | |||||||||||||||||||||
 J Paul  K Sultanov | 77 | 6 | J Paul K Sultanov | 1 | 6 | [9] | |||||||||||||||||||||
| 2 | F Cabral A Dougaz | 65 | 4 | ||||||||||||||||||||||||
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