| 2021 Bol Open | |
|---|---|
| Date | 7–12 June |
| Edition | 15th |
| Category | WTA 125K series |
| Prize money | $115,000 |
| Surface | Clay |
| Location | Bol, Croatia |
| Venue | Bluesun Tennis Center Zlatni rat |
| Champions | |
| Singles | |
 Jasmine Paolini | |
| Doubles | |
 Aliona Bolsova /  Katarzyna Kawa | |
The 2021 Bol Open was a professional tennis tournament played on outdoor clay courts. It was the fifteenth edition of the tournament and part of the 2021 WTA 125K series. The tournament could not be held in 2020 due to the COVID-19 pandemic.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 RUS | Anna Blinkova | 77 | 1 |
 NED | Arantxa Rus | 83 | 2 |
| ITA | Jasmine Paolini | 91 | 3 |
| ITA | Martina Trevisan | 97 | 4 |
| ITA | Sara Errani | 105 | 5 |
| RUS | Ludmilla Samsonova | 106 | 6 |
| ESP | Aliona Bolsova | 107 | 7 |
 HUN | Tímea Babos | 111 | 8 |
The following players received a wildcard into the singles main draw:
The following players received entry using protected rankings:
The following players entered the singles main draw through qualification:
Eugenie Bouchard → replaced by 
Ysaline Bonaventure Elisabetta Cocciaretto → replaced by 
Irina Bara Varvara Gracheva → replaced by 
Renata Zarazúa Anna Kalinskaya → replaced by 
Olga Govortsova 
Danka Kovinić → replaced by 
Priscilla Hon 
Bernarda Pera → replaced by Usue Maitane Arconada 
Rebecca Peterson → replaced by 
Katarina Zavatska Sara Sorribes Tormo → replaced by Katarzyna Kawa Patricia Maria Țig → replaced by 
Barbara Haas 
Zhu Lin → replaced by Claire Liu 
Tamara Zidanšek → replaced by Nuria Párrizas Díaz | Country | Player | Country | Player | Rank1 | Seed |
|---|---|---|---|---|---|
 SVK | Viktória Kužmová | NED | Arantxa Rus | 98 | 1 |
 JPN | Miyu Kato |  CZE | Renata Voráčová | 143 | 2 |
| POL | Katarzyna Piter | NED | Rosalie van der Hoek | 227 | 3 |
 KAZ | Anna Danilina | BLR | Lidziya Marozava | 247 | 4 |
Jasmine Paolini def. Arantxa Rus 6–2, 7–6(7–4) Aliona Bolsova / Katarzyna Kawa def. 
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