| Doubles | |
|---|---|
| 2021 Tampere Open | |
| Champions |  Pedro Cachin Facundo Mena |
| Runners-up |  Orlando Luz Felipe Meligeni Alves |
| Score | 7–5, 6–3 |
Sander Arends and David Pel were the defending champions [1] but chose not to defend their title.
Pedro Cachin and Facundo Mena won the title after defeating Orlando Luz and Felipe Meligeni Alves 7–5, 6–3 in the final.
Orlando Luz / Felipe Meligeni Alves (final)
Sergio Galdós / 
Gonçalo Oliveira (first round, withdrew)
Manuel Guinard / Antoine Hoang (first round, withdrew) Pedro Cachin / Facundo Mena (champions)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | O Luz F Meligeni Alves | 65 | 6 | [10] | |||||||||||||||||||||||
 M Eriksson  P Matuszewski | 3 | 6 | [8] | G Blancaneaux  A Erler | 77 | 3 | [2] | ||||||||||||||||||||
| G Blancaneaux A Erler | 6 | 3 | [10] | 1 | O Luz F Meligeni Alves | 3 | 6 | [10] | |||||||||||||||||||
| 3 | M Guinard A Hoang |  R Gonzales  H Johnson | 6 | 1 | [8] | ||||||||||||||||||||||
J Domingues  D Popko | w/o | J Domingues D Popko | |||||||||||||||||||||||||
| R Gonzales H Johnson | 2 | 7 | [10] | R Gonzales H Johnson | w/o | ||||||||||||||||||||||
| WC | Leo Borg O Virtanen | 6 | 5 | [4] | 1 | O Luz F Meligeni Alves | 5 | 3 | |||||||||||||||||||
 G Smits B Stevens | 6 | 6 | 4 | P Cachin F Mena | 7 | 6 | |||||||||||||||||||||
| WC | Peetu Pohjola Roni Rikkonen | 3 | 3 | G Smits B Stevens | 4 | 3 | |||||||||||||||||||||
 L Castelnuovo K Jacquet | 1 | 4 | 4 | P Cachin F Mena | 6 | 6 | |||||||||||||||||||||
| 4 | P Cachin F Mena | 6 | 6 | 4 | P Cachin F Mena | 6 | 6 | ||||||||||||||||||||
| G Andreozzi N Kicker | 7 | 77 | G Andreozzi N Kicker | 3 | 2 | ||||||||||||||||||||||
| WC | E Vasa Iiro Vasa | 5 | 65 | G Andreozzi N Kicker | 6 | 6 | |||||||||||||||||||||
 B Bobrov Oscar José Gutierrez | w/o | B Bobrov OJ Gutierrez | 3 | 3 | |||||||||||||||||||||||
| 2 | S Galdós G Oliveira | ||||||||||||||||||||||||||
Hugo Dellien and Guillermo Durán were the defending champions but only Dellien chose to defend his title, partnering Federico Zeballos. Dellien and Zeballos withdrew before their quarterfinal match.
Guillermo Durán and Roberto Quiroz were the defending champions but only Quiroz chose to defend his title, partnering Yannick Hanfmann. Quiroz lost in the first round to Luis David Martínez and Felipe Meligeni Alves.
Guido Andreozzi and Guillermo Durán were the defending champions but chose not to defend their title.
Guido Andreozzi and Guillermo Durán were the defending champions but only Durán chose to defend his title, partnering Mariano Kestelboim. Durán lost in the first round to Facundo Mena and Camilo Ugo Carabelli.
Orlando Luz and Rafael Matos were the defending champions but only Matos chose to defend his title, partnering João Menezes. Matos withdrew from the tournament before his quarterfinal match.
Franco Agamenone and Fernando Romboli were the defending champions but chose not to defend their title.
Rafael Matos and João Menezes were the defending champions but chose not to defend their title.
The 2021 Tampere Open was a professional tennis tournament played on clay courts. It was the 39th edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Tampere, Finland, on 19–25 July 2021.
Ariel Behar and Andrey Golubev were the defending champions but chose not to defend their title.
Sadio Doumbia and Fabien Reboul were the defending champions but chose not to defend their title.
Felipe Meligeni Alves was the defending champion but withdrew before his semifinal match with Luciano Darderi.
Simone Bolelli and Máximo González were the defending champions but Bolelli chose not to participate. González was scheduled to partner Nicolás Jarry, but Jarry withdrew with a right elbow injury before their first round match.
Evan King and Max Schnur were the defending champions but chose not to defend their title.
Gerald Melzer was the defending champion but lost in the final to Juan Pablo Ficovich.
Orlando Luz and Felipe Meligeni Alves were the defending champions but only Meligeni Alves chose to defend his title, partnering Marcelo Demoliner. Meligeni Alves lost in the quarterfinals to Luciano Darderi and Fernando Romboli.
Orlando Luz and Felipe Meligeni Alves were the defending champions but only Meligeni Alves chose to defend his title, partnering Marcelo Demoliner. Meligeni Alves lost in the quarterfinals to Marco Bortolotti and Sergio Martos Gornés.
Sebastián Báez was the defending champion but chose not to defend his title.
Rafael Matos and Felipe Meligeni Alves were the defending champions but only Meligeni Alves chose to defend his title, partnering Matheus Pucinelli de Almeida. Meligeni Alves withdrew before his first round match due to injury.
Rafael Matos and Felipe Meligeni Alves were the defending champions but only Meligeni Alves chose to defend his title, partnering Matheus Pucinelli de Almeida. They withdrew before their first round match.
Corentin Moutet was the defending champion but chose not to defend his title.