# 2021 US Open – Girls' doubles

Kamilla Bartone and Oksana Selekhmeteva were the defending champions, having won the previous edition in 2019, however Bartone was no longer eligible to participate in junior events, whilst Selekhmeteva chose not to participate.
Ashlyn Krueger and Robin Montgomery won the title, defeating Reese Brantmeier and Elvina Kalieva in the final, 5–7, 6–3, [10–4].

## Seeds

All seeds received a bye into the second round.
* Victoria Jiménez Kasintseva / Ane Mintegi del Olmo (semifinals)
* Kristina Dmitruk / Diana Shnaider (quarterfinals)
* Ashlyn Krueger / Robin Montgomery (champions)
* Petra Marčinko / Natália Szabanin (second round)
* Brenda Fruhvirtová / Linda Fruhvirtová (quarterfinals)
* Alex Eala / Hanne Vandewinkel (semifinals)
* Mara Guth / Julia Middendorf (quarterfinals)
* Reese Brantmeier / Elvina Kalieva (final)

## 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

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| 1 | Victoria Jiménez Kasintseva Ane Mintegi del Olmo | 1 | 5 | | | | | | |
| 3 | Ashlyn Krueger Robin Montgomery | 6 | 7 | | | | | | |
| 3 | Ashlyn Krueger Robin Montgomery | 6 | 7 | | 3 | Ashlyn Krueger Robin Montgomery | 5 | 6 | [10] |
| | | | | | 8 | Reese Brantmeier Elvina Kalieva | 7 | 3 | [4] |
| 6 | Alex Eala Hanne Vandewinkel | 7 | 2 | [7] | 8 | Reese Brantmeier Elvina Kalieva | 7 | 3 | [4] |
| 8 | Reese Brantmeier Elvina Kalieva | 5 | 6 | [10] | | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| | | | | | 1 | V Jiménez Kasintseva A Mintegi del Olmo | 6 | 2 | [10] | | | | | | | | | |
| | Clervie Ngounoue Charlotte Owensby | 6 | 6 | | | C Ngounoue C Owensby | 3 | 6 | [7] | | | | | | | | | |
| | Bianca Behúlová Alina Shcherbinina | 4 | 4 | | | | | | | 1 | V Jiménez Kasintseva A Mintegi del Olmo | 6 | 7$^7$ | | | | | |
| WC | Sarah Hamner Liv Hovde | 6 | 3 | [5] | | | | | | 5 | B Fruhvirtová L Fruhvirtová | 4 | 6$^3$ | | | | | |
| | Pimrada Jattavapornvanit Annabelle Xu | 4 | 6 | [10] | | P Jattavapornvanit A Xu | 5 | 3 | | | | | | | | | | |
| | | | | | 5 | B Fruhvirtová L Fruhvirtová | 7 | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | | 1 | V Jiménez Kasintseva A Mintegi del Olmo | 1 | 5 |
| | | | | | | | | | | | | | | | 3 | A Krueger R Montgomery | 6 | 7 |
| | | | | | 3 | A Krueger R Montgomery | 6 | 6 | | | | | | | | | | |
| | Sofia Costoulas Laura Hietaranta | 2 | 4 | | | J García M Mutavdzic | 4 | 1 | | | | | | | | | | |
| | Julia García Matilda Mutavdzic | 6 | 6 | | | | | | | 3 | A Krueger R Montgomery | 4 | 6 | [15] | | | | |
| | Marina Stakusic Yang Ya-yi | 4 | 3 | | | | | | | 7 | M Guth J Middendorf | 6 | 2 | [13] | | | | |
| | Ariana Pursoo Theadora Rabman | 6 | 6 | | | A Pursoo T Rabman | 1 | 4 | | | | | | | | | | |
| | | | | | 7 | M Guth J Middendorf | 6 | 6 | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| | | | | 6 | A Eala H Vandewinkel | 6 | 3 | [10] | | | | | | | | | | |
| | Michaela Laki Radka Zelníčková | 6 | 7 | | M Laki R Zelníčková | 3 | 6 | [6] | | | | | | | | | | |
| WC | Tatum Evans Amelia Honer | 0 | 5 | | | | | | 6 | A Eala H Vandewinkel | 6 | 6$^4$ | [10] | | | | | |
| | Solana Sierra Johanne Svendsen | 4 | 3 | | | | | | | E Coleman M Sieg | 1 | 7$^7$ | [7] | | | | | |
| | Elizabeth Coleman Madison Sieg | 6 | 6 | | E Coleman M Sieg | 6 | 6 | | | | | | | | | | | |
| | | | | 4 | P Marčinko N Szabanin | 4 | 4 | | | | | | | | | | | |
| | | | | | | | | | | | | | | 6 | A Eala H Vandewinkel | 7 | 2 | [7] |
| | | | | | | | | | | | | | | 8 | R Brantmeier E Kalieva | 5 | 6 | [10] |
| | | | | 8 | R Brantmeier E Kalieva | 6 | 6 | | | | | | | | | | | |
| | Dana Guzmán Linda Klimovičová | 7 | 6 | | D Guzmán L Klimovičová | 2 | 4 | | | | | | | | | | | |
| | Lucija Ćirić Bagarić Sebastianna Scilipoti | 5 | 4 | | | | | | 8 | R Brantmeier E Kalieva | 7$^7$ | 6 | | | | | | |
| | Océane Babel Sabina Zeynalova | | | | | | | | 2 | K Dmitruk D Shnaider | 6$^5$ | 1 | | | | | | |
| | Alexis Blokhina Valencia Xu | w/o | | | A Blokhina V Xu | 3 | 3 | | | | | | | | | | | |
| | | | | 2 | K Dmitruk D Shnaider | 6 | 6 | | | | | | | | | | | |