| 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 | |
|  Anett Kontaveit | |
| Doubles | |
|  Irina Bara /  Ekaterine Gorgodze | |
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. Anett Kontaveit def. Simona Halep, 6–2, 6–3 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 / Irina Bara / Ekaterine Gorgodze def. Ekaterine Gorgodze def. Aleksandra Krunić / Aleksandra Krunić / Lesley Pattinama Kerkhove, 4–6, 6–1, [11–9]. 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 | 
|---|---|---|---|
|  ROU | Simona Halep | 19 | 1 | 
|  EST | Anett Kontaveit | 20 | 2 | 
|  GBR | Emma Raducanu | 24 | 3 | 
| .svg.png.webp) SUI | Jil Teichmann | 39 | 4 | 
| .svg.png.webp) AUS | Ajla Tomljanović | 43 | 5 | 
|  UKR | Marta Kostyuk | 53 | 6 | 
|  ROU | Irina-Camelia Begu | 56 | 7 | 
|  UKR | 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 Anna Bondár
 Anastasia Gasanova Anastasia Gasanova
 Alexandra Ignatik Alexandra Ignatik
 Aleksandra Krunić Aleksandra Krunić
 Lesley Pattinama Kerkhove Lesley Pattinama Kerkhove
 Lesia Tsurenko Lesia Tsurenko
The following player received entry as a lucky loser:
Withdrawals
- Before the tournament
 Ekaterina Alexandrova → replaced by Ekaterina Alexandrova → replaced by Polona Hercog Polona Hercog
 Paula Badosa → replaced by Paula Badosa → replaced by Anna-Lena Friedsam Anna-Lena Friedsam
.svg.png.webp) Viktorija Golubic → replaced by Viktorija Golubic → replaced by.svg.png.webp) Alison Van Uytvanck Alison Van Uytvanck
 Kaia Kanepi → replaced by Kaia Kanepi → replaced by Ivana Jorović Ivana Jorović
 Veronika Kudermetova → replaced by Veronika Kudermetova → replaced by Bernarda Pera Bernarda Pera
.svg.png.webp) Elise Mertens → replaced by Elise Mertens → replaced by Elena-Gabriela Ruse Elena-Gabriela Ruse
 Camila Osorio → replaced by Camila Osorio → replaced by Jana Fett Jana Fett
 Mayar Sherif → replaced by Mayar Sherif → replaced by Mona Barthel Mona Barthel
Doubles main draw entrants
Seeds
| Country | Player | Country | Player | Rank1 | Seed | 
|---|---|---|---|---|---|
|  USA | Kaitlyn Christian |  NZL | Erin Routliffe | 107 | 1 | 
|  SRB | Aleksandra Krunić |  NED | Lesley Pattinama Kerkhove | 123 | 2 | 
|  ROU | Monica Niculescu |  ROU | Elena-Gabriela Ruse | 140 | 3 | 
|  KAZ | Anna Danilina |  NOR | 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
.svg.png.webp) Sharon Fichman / Sharon Fichman / Giuliana Olmos → replaced by Giuliana Olmos → replaced by Alena Fomina-Klotz / Alena Fomina-Klotz / Ekaterina Yashina Ekaterina Yashina
 Ulrikke Eikeri / Ulrikke Eikeri / Catherine Harrison → replaced by Catherine Harrison → replaced by Anna Danilina / Anna Danilina / Ulrikke Eikeri Ulrikke Eikeri