| Doubles | ||||
|---|---|---|---|---|
| 2021 Biella Challenger Indoor II | ||||
| Final | ||||
| Champions |  Hugo Nys Tim Pütz | |||
| Runners-up |  Lloyd Glasspool Harri Heliövaara | |||
| Score | 7–6, 6–3 | |||
| Events | ||||
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This was the second of seven editions of the tournament in the 2021 tennis season. Luis David Martínez and David Vega Hernández were the defending champions but lost in the quarterfinals to Nathaniel Lammons and Jackson Withrow.
Hugo Nys and Tim Pütz won the title after defeating Lloyd Glasspool and Harri Heliövaara 7–6, 6–3 in the final.
Seeds
- Hugo Nys / Tim Pütz (champions)
Jonathan Erlich / 
Andrei Vasilevski (first round)
André Göransson / 
David Pel (first round)
Nathaniel Lammons / Jackson Withrow (semifinals)
Draw
Key
- Q = Qualifier
- WC = Wild card
- LL = Lucky loser
- Alt = Alternate
- SE = Special exempt
- PR = Protected ranking
- ITF = ITF entry
- JE = Junior exempt
- w/o = Walkover
- r = Retired
- d = Defaulted
- SR = Special ranking
| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | H Nys T Pütz
| 3 | 6 | ||||||||||||||||||||||||
| E King H Reese
| 6 | 4 | 1 | H Nys T Pütz
| 6 | 6 | |||||||||||||||||||||
R Arneodo A Olivetti
| 6 | 6 | R Arneodo A Olivetti
| 2 | 4 | ||||||||||||||||||||||
 D Molchanov A Nedovyesov
| 3 | 7 | 1 | H Nys T Pütz
| w/o | ||||||||||||||||||||||
| 3 | A Göransson D Pel
| 5 | 4 |  T Huey S Verbeek
| |||||||||||||||||||||||
| T Huey S Verbeek
| 7 | 6 | T Huey S Verbeek
| 6 | 6 | ||||||||||||||||||||||
| WC |  T Fabbiano M Gigante
| 3 | 6 | WC | L Nardi G Zeppieri
| 4 | 3 | ||||||||||||||||||||
| WC | L Nardi G Zeppieri
| 6 | 3 | 1 | H Nys T Pütz
| 7 | 6 | ||||||||||||||||||||
 LD Martínez D Vega Hernández
| 6 | 7 | L Glasspool H Heliövaara
| 6 | 3 | ||||||||||||||||||||||
| WC | S Napolitano L Vanni
| 7 | 5 | LD Martínez D Vega Hernández
| 5 | 4 | |||||||||||||||||||||
 K Majchrzak N Pasha
| 4 | 4 | 4 | N Lammons J Withrow
| 7 | 6 | |||||||||||||||||||||
| 4 | N Lammons J Withrow
| 6 | 6 | 4 | N Lammons J Withrow
| 6 | 6 | ||||||||||||||||||||
| R Galloway A Lawson
| 7 | 3 | L Glasspool H Heliövaara
| 7 | 7 | ||||||||||||||||||||||
| L Glasspool H Heliövaara
| 6 | 6 | L Glasspool H Heliövaara
| 6 | 6 | ||||||||||||||||||||||
| A Davidovich Fokina B Zapata Miralles
| 6 | 7 | A Davidovich Fokina B Zapata Miralles
| 3 | 4 | ||||||||||||||||||||||
| 2 | J Erlich A Vasilevski
| 4 | 5 | ||||||||||||||||||||||||