| Doubles | |
|---|---|
| 2021 Biella Challenger Indoor | |
| Champions |  Luis David Martínez  David Vega Hernández |
| Runners-up |  Szymon Walków Jan Zieliński |
| Final score | 6–4, 3–6, [10–8] |
This was the first of seven editions of the tournament in the 2021 tennis season. [1]
Luis David Martínez and David Vega Hernández won the title after defeating Szymon Walków and Jan Zieliński 6–4, 3–6, [10–8] in the final.
Luca Margaroli / 
Andrei Vasilevski (quarterfinals) Luis David Martínez / David Vega Hernández (champions)
Lloyd Glasspool / 
Harri Heliövaara (first round)
Robert Galloway / Alex Lawson (semifinals)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | L Margaroli A Vasilevski | 7 | 6 | ||||||||||||||||||||||||
T-S Kwiatkowski  D Popko | 5 | 3 | 1 | L Margaroli A Vasilevski | 2 | 5 | |||||||||||||||||||||
| WC |  Daniele Augenti Massimo Giunta | 1 | 3 | S Walków J Zieliński | 6 | 7 | |||||||||||||||||||||
| S Walków J Zieliński | 6 | 6 | S Walków J Zieliński | 6 | 65 | [10] | |||||||||||||||||||||
| 4 | R Galloway A Lawson | 6 | 6 | 4 | R Galloway A Lawson | 4 | 77 | [6] | |||||||||||||||||||
| WC | Pietro Buscaglione G Fonio | 1 | 2 | 4 | R Galloway A Lawson | 77 | 5 | [10] | |||||||||||||||||||
J Cerretani  A Shamasdin | 7 | 6 | J Cerretani A Shamasdin | 63 | 7 | [7] | |||||||||||||||||||||
| E King N Pasha | 5 | 2 | S Walków J Zieliński | 4 | 6 | [8] | |||||||||||||||||||||
 L Lacko  D Masur | 1 | 3 | 2 | LD Martínez D Vega Hernández | 6 | 3 | [10] | ||||||||||||||||||||
 T Huey  S Verbeek | 6 | 6 | T Huey S Verbeek | 6 | 6 | ||||||||||||||||||||||
 I Sabanov M Sabanov | 6 | 3 | [10] | I Sabanov M Sabanov | 4 | 4 | |||||||||||||||||||||
| 3 | L Glasspool H Heliövaara | 3 | 6 | [7] | T Huey S Verbeek | 5 | 3 | ||||||||||||||||||||
| T Fabbiano M Kližan | 77 | 6 | 2 | LD Martínez D Vega Hernández | 7 | 6 | |||||||||||||||||||||
| WC | S Napolitano L Vanni | 65 | 4 | T Fabbiano M Kližan | 3 | 4 | |||||||||||||||||||||
| F Gaio A Pellegrino | 6 | 4 | [8] | 2 | LD Martínez D Vega Hernández | 6 | 6 | ||||||||||||||||||||
| 2 | LD Martínez D Vega Hernández | 2 | 6 | [10] | |||||||||||||||||||||||
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