2021 Quito Challenger – Doubles
| Doubles | |
|---|---|
| 2021 Quito Challenger | |
| Champions | |
| Runners-up | |
| Score | 7–5, 6–7(5–7), [10–8] | 
Marcelo Arévalo and Miguel Ángel Reyes-Varela were the defending champions[1] but chose not to defend their title.
Alejandro Gómez and Thiago Agustín Tirante won the title after defeating Adrián Menéndez Maceiras and Mario Vilella Martínez 7–5, 6–7(5–7), [10–8] in the final.
Seeds
 Diego Hidalgo / 
 Cristian Rodríguez (quarterfinals)
 Adrián Menéndez Maceiras / 
 Mario Vilella Martínez (final)
 Eduard Esteve Lobato / 
 Oriol Roca Batalla (first round)
 Emilio Gómez / 
 Roberto Quiroz (first round)
Draw
Key
- Q = Qualifier
 - WC = Wild card
 - LL = Lucky loser
 - Alt = Alternate
 - ITF = ITF entry
 - PR = Protected ranking
 - SR = Special ranking
 - SE = Special exempt
 - JE = Junior exempt
 - JR = Junior Accelerator Programme entrant
 - CO = College Accelerator Programme entrant
 - NG = Next Gen Accelerator Program entrant
 - w/o = Walkover
 - r = Retired
 - d = Defaulted