2021 Upper Austria Ladies Linz

The 2021 Upper Austria Ladies Linz was a women's tennis tournament played on indoor hard courts. It was the 31st edition of the Linz Open, and was part of the WTA 250 series of the 2021 WTA Tour. It was held at the TipsArena Linz in Linz, Austria, from 6 to 12 November 2021.

Singles

 * 🇺🇸 Alison Riske def. 🇷🇴 Jaqueline Cristian, 2–6, 6–2, 7–5.

This was Riske's third WTA Tour title, and first of the year.

Doubles

 * 🇷🇺 Natela Dzalamidze / 🇷🇺 Kamilla Rakhimova def. 🇨🇳 Wang Xinyu / 🇨🇳 Zheng Saisai 6–4, 6–2

Prize money
1 Qualifiers prize money is also the Round of 32 prize money
 * per team

Seeds

 * Rankings as of November 1, 2021

Other entrants
The following players received wildcards into the singles main draw:
 * 🇦🇹 Julia Grabher
 * 🇷🇴 Simona Halep
 * 🇦🇹 Sinja Kraus
 * 🇬🇧 Emma Raducanu

The following player received entry using a protected ranking:
 * 🇩🇪 Mona Barthel

The following players received entry from the qualifying draw:
 * 🇺🇦 Kateryna Kozlova
 * 🇫🇷 Harmony Tan
 * 🇺🇦 Lesia Tsurenko
 * 🇨🇳 Wang Xinyu

The following player received entry as lucky loser:
 * 🇷🇴 Jaqueline Cristian

Withdrawals

 * Before the tournament
 * 🇷🇴 Irina-Camelia Begu → replaced by 🇧🇾 Aliaksandra Sasnovich
 * 🇷🇴 Sorana Cîrstea → replaced by 🇷🇴 Jaqueline Cristian
 * 🇫🇷 Caroline Garcia → replaced by 🇨🇳 Zheng Saisai
 * Viktorija Golubic → replaced by 🇩🇪 Mona Barthel
 * 🇪🇪 Kaia Kanepi → replaced by 🇧🇪 Greet Minnen
 * 🇺🇦 Marta Kostyuk → replaced by 🇫🇷 Fiona Ferro
 * 🇺🇸 Ann Li → replaced by 🇫🇷 Clara Burel
 * Petra Martić → replaced by 🇷🇺 Kamilla Rakhimova
 * 🇨🇴 Camila Osorio → replaced by 🇸🇪 Rebecca Peterson
 * 🇦🇺 Ajla Tomljanović → replaced by 🇫🇷 Océane Dodin
 * 🇨🇳 Zhang Shuai → replaced by 🇺🇦 Dayana Yastremska

Seeds

 * 1 Rankings as of November 1, 2021

Other entrants
The following pair received a wildcard into the doubles main draw:
 * 🇦🇹 Julia Grabher / 🇦🇹 Sinja Kraus

The following pairs received entry using protected rankings:
 * 🇩🇪 Mona Barthel / Hsieh Yu-chieh
 * 🇷🇺 Irina Khromacheva / 🇧🇾 Lidziya Marozava