| 2021 Transylvania Open | |
|---|---|
| Date | 25–31 October | 
| Edition | 1st | 
| Category | WTA 250 | 
| Draw | 32S / 16Q / 16D | 
| Prize money | $235,238 | 
| Surface | Hard (Indoor) | 
| Location | Cluj-Napoca, Romania | 
| Venue | BT Arena | 
| Champions | |
| Singles | |
| Doubles | |
The 2021 Transylvania Open was a women's tennis tournament played on indoor hard courts.[1] It was the first edition of the Transylvania Open, and part of the WTA 250 series of the 2021 WTA Tour. It was held at the BT Arena in Cluj-Napoca, Romania, from 25 until 31 October, 2021.[2]
Champions
Singles
 Anett Kontaveit def. 
 Simona Halep, 6–2, 6–3
This was Kontaveit's fifth career WTA singles title, and was her fourth of the year. By winning the title, Kontaveit qualified for the WTA Finals.
Doubles
 Irina Bara / 
 Ekaterine Gorgodze def. 
 Aleksandra Krunić / 
 Lesley Pattinama Kerkhove, 4–6, 6–1, [11–9].
This was the first WTA Tour level doubles title won by either Bara or Gorgodze.
Singles main draw entrants
Seeds
| Country | Player | Rank1 | Seed | 
|---|---|---|---|
| Simona Halep | 19 | 1 | |
| Anett Kontaveit | 20 | 2 | |
| Emma Raducanu | 24 | 3 | |
| Jil Teichmann | 39 | 4 | |
| Ajla Tomljanović | 43 | 5 | |
| Marta Kostyuk | 53 | 6 | |
| Irina-Camelia Begu | 56 | 7 | |
| Anhelina Kalinina | 57 | 8 | 
- Rankings are as of October 18, 2021. [3]
 
Other entrants
The following players received wildcards into the main draw:
The following players received entry using a protected ranking:
The following players received entry from the qualifying draw:
 Anna Bondár
 Anastasia Gasanova
 Alexandra Ignatik
 Aleksandra Krunić
 Lesley Pattinama Kerkhove
 Lesia Tsurenko
The following player received entry as a lucky loser:
Withdrawals
- Before the tournament
 
 Ekaterina Alexandrova → replaced by 
 Polona Hercog
 Paula Badosa → replaced by 
 Anna-Lena Friedsam
 Viktorija Golubic → replaced by 
 Alison Van Uytvanck
 Kaia Kanepi → replaced by 
 Ivana Jorović
 Veronika Kudermetova → replaced by 
 Bernarda Pera
 Elise Mertens → replaced by 
 Elena-Gabriela Ruse
 Camila Osorio → replaced by 
 Jana Fett
 Mayar Sherif → replaced by 
 Mona Barthel
Doubles main draw entrants
Seeds
| Country | Player | Country | Player | Rank1 | Seed | 
|---|---|---|---|---|---|
| Kaitlyn Christian | Erin Routliffe | 107 | 1 | ||
| Aleksandra Krunić | Lesley Pattinama Kerkhove | 123 | 2 | ||
| Monica Niculescu | Elena-Gabriela Ruse | 140 | 3 | ||
| Anna Danilina | Ulrikke Eikeri | 153 | 4 | 
- Rankings are as of October 18, 2021.
 
Other entrants
The following pairs received wildcards into the doubles main draw:
Withdrawals
- Before the tournament
 
 Sharon Fichman / 
 Giuliana Olmos → replaced by 
 Alena Fomina-Klotz / 
 Ekaterina Yashina
 Ulrikke Eikeri / 
 Catherine Harrison → replaced by 
 Anna Danilina / 
 Ulrikke Eikeri