| Date: | 5–10 July (women) 12–18 July (men) |
| Edition: | 73rd (men) 11th (women) |
| Surface: | Clay |
| Venue: | Båstad tennis stadium |
| Champms: |  Casper Ruud |
| Champmd: | Sander Arends / David Pel |
| Champwd: |  Mirjam Björklund / Leonie Küng |
| Before Year: | 2019 |
The 2021 Swedish Open was a tennis tournament played on outdoor clay courts as part of the ATP Tour 250 Series of the 2021 ATP Tour[1] and as part of the WTA 125K Series.[2] It took place in Båstad, Sweden, from 12 through 18 July 2021 for the men's tournament, and from 5 through 10 July 2021 for the women's tournament.[3] It was the 73rd edition of the event for the men and the 11th edition for the women.
See main article: 2021 Swedish Open – Men's singles.
Casper Ruud def. 
Federico Coria, 6–3, 6–3See main article: 2021 Swedish Open – Women's singles.
Nuria Párrizas Díaz def. 
Olga Govortsova 6–2, 6–2See main article: 2021 Swedish Open – Men's doubles.
Albano Olivetti, 6–4, 6–2See main article: 2021 Swedish Open – Women's doubles.
Mirjam Björklund / Leonie Küng def. 
Tereza Mihalíková / 
Kamilla Rakhimova 5–7, 6–3, [10–5]| Event | W | F | SF | QF | Round of 16 | Round of 32 | width=85 | Q | width=85 | Q2 | width=85 | Q1 |
| Singles | 250 | 150 | 90 | 45 | 20 | 0 | 12 | 6 | 0 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubles | 0 |
| Event | W | F | SF | QF | Round of 16 | Round of 32 | width=85 | Q2 | width=85 | Q1 |
| Singles | €41,145 | €29,500 | €21,000 | €14,000 | €9,000 | €5,415 | €2,645 | €1,375 | ||
| Doubles* | €15,360 | €11,000 | €7,250 | €4,710 | €2,760 |
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Norway | Casper Ruud | 14 | 1 | |
| Cristian Garín | 20 | 2 | ||
 Italy | Fabio Fognini | 31 | 3 | |
 Australia | John Millman | 43 | 4 | |
| France | Richard Gasquet | 56 | 5 | |
| Italy | Lorenzo Musetti | 63 | 6 | |
 Czech Republic | Jiří Veselý | 72 | 7 | |
 Finland | Emil Ruusuvuori | 76 | 8 |
The following players received wildcards into the main draw:
The following players received entry from the qualifying draw:
Carlos Alcaraz → replaced by 
Taro Daniel Alejandro Davidovich Fokina → replaced by Roberto Carballés Baena Ilya Ivashka → replaced by Facundo Bagnis
Denis Shapovalov → replaced by Pedro Sousa Stefano Travaglia → replaced by Salvatore Caruso Jo-Wilfried Tsonga → replaced by Yannick Hanfmann| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| Argentina | Andrés Molteni | Italy | Andrea Vavassori | 143 | 1 | |
| Sweden | André Göransson |  Denmark | Frederik Nielsen | 162 | 2 | |
| Pablo Cuevas | France | Fabrice Martin | 168 | 3 | ||
| Nicholas Monroe | Belarus | Andrei Vasilevski | 168 | 4 |
The following pairs received wildcards into the doubles main draw:
Marco Cecchinato / Stefano Travaglia → replaced by Roberto Carballés Baena / Marco Cecchinato
Rohan Bopanna / Divij Sharan → replaced by Jeevan Nedunchezhiyan / Purav Raja
Radu Albot / Ilya Ivashka → replaced by Radu Albot / 
Denys Molchanov Carlos Alcaraz / Marc López → replaced by Andre Begemann / Albano Olivetti| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Sweden | Rebecca Peterson | 60 | 1 | |
| Russian Federation | Anna Kalinskaya | 109 | 2 | |
 Egypt | Mayar Sherif | 119 | 3 | |
| Claire Liu | 120 | 4 | ||
| Slovakia | Anna Karolína Schmiedlová | 122 | 5 | |
| Russian Federation | Kamilla Rakhimova | 134 | 6 | |
| Belarus | Olga Govortsova | 136 | 7 | |
| Australia | Maddison Inglis | 140 | 8 |
The following players received wildcards into the main draw:
Vanessa Ersöz Caijsa Hennemann[4] Fanny Östlund Lisa ZaarThe following players received entry using protected rankings:
Daria Lopatetska Karman Thandi
Hailey Baptiste → replaced by Katie Volynets Cristina Bucșa → replaced by Daria Lopatetska Asia Muhammad → replaced by 
Anna Bondár Storm Sanders → replaced by 
Francesca Jones Karman Thandi| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| Spain | Lara Arruabarrena | Spain | Aliona Bolsova | 194 | 1 | |
| Sweden | Cornelia Lister |  New Zealand | Erin Routliffe | 248 | 2 | |
| Slovakia | Tereza Mihalíková | Russian Federation | Kamilla Rakhimova | 306 | 3 | |
| Hungary | Anna Bondár |  Romania | Jaqueline Cristian | 369 | 4 |
