The 2021 Nottingham Open (also known as the Viking Open Nottingham for sponsorship purposes) was a professional tennis tournament played on outdoor grass courts. It was the 13th edition of the event for women and the 25th edition for men. It was classified as a WTA 250 on the 2021 WTA Tour for the women, and as an ATP Challenger Tour event for the men. The event took place at the Nottingham Tennis Centre in Nottingham, United Kingdom from 6 through 13 June 2021.
Champions
Men's singles
Frances Tiafoe def. Denis Kudla 6–1, 6–3.
Women's singles
Johanna Konta def. Zhang Shuai 6–2, 6–1
Men's doubles
Matt Reid / Ken Skupski def. Matthew Ebden / John-Patrick Smith 4–6, 7–5, [10–6].
Women's doubles
Lyudmyla Kichenok / Makoto Ninomiya def. Caroline Dolehide / Storm Sanders, 6–4, 6–7(3–7), [10–8]
ATP singles main-draw entrants
Seeds
1 Rankings are as of 31 May 2021.
Other entrants
The following players received wildcards into the main draw: Jay Clarke Dan Evans Ryan Peniston
The following players received entry from the qualifying draw: Marius Copil Matthew Ebden Borna Gojo Aleksandar Vukic
WTA singles main-draw entrants
Seeds
1 Rankings are as of 31 May 2021.
Other entrants
The following players received wildcards into the main draw: Katie Boulter Jodie Burrage Francesca Jones Emma Raducanu
The following players received entry from the qualifying draw: Sarah Beth Grey Kateryna Kozlova Tara Moore Lesley Pattinama Kerkhove Ankita Raina Eden Silva CoCo Vandeweghe Katie Volynets
The following players received entry as lucky losers: Martina Di Giuseppe Georgina García Pérez Marina Melnikova
Withdrawals
Before the tournament
Paula Badosa → replaced by Kurumi Nara
Belinda Bencic → replaced by Caty McNally
Danielle Collins → replaced by Marina Melnikova
Misaki Doi → replaced by Kristie Ahn
Camila Giorgi → replaced by Martina Di Giuseppe
Polona Hercog → replaced by Georgina García Pérez
Hsieh Su-wei → replaced by Arina Rodionova
Marta Kostyuk → replaced by Wang Yafan
Ann Li → replaced by Viktoriya Tomova
Magda Linette → replaced by María Camila Osorio Serrano
Jessica Pegula → replaced by Wang Xiyu
Kristýna Plíšková → replaced by Maddison Inglis
Yulia Putintseva → replaced by Harriet Dart
Shelby Rogers → replaced by Lizette Cabrera
Elena Rybakina → replaced by Océane Dodin
Clara Tauson → replaced by Zarina Diyas
Ajla Tomljanović → replaced by Wang Xinyu
Venus Williams → replaced by Giulia Gatto-Monticone
Wang Qiang → replaced by Anastasia Gasanova
Zheng Saisai → replaced by Leonie Küng
Retirements
Kristie Ahn
WTA doubles main-draw entrants
Seeds
1 Rankings are as of 31 May 2021.
Other entrants
The following pairs received wildcards into the doubles main draw: Katie Boulter / Jodie Burrage Naomi Broady / Harriet Dart
The following pair received entry using a protected ranking: Christina McHale / CoCo Vandeweghe
The following pair received entry as an alternate: Marie Bouzková / Alicja Rosolska
Withdrawals
Before the tournament
Lauren Davis / Caty McNally → replaced by Marie Bouzková / Alicja Rosolska
Sharon Fichman / Giuliana Olmos → replaced by Elixane Lechemia / Ingrid Neel
Vivian Heisen / Květa Peschke → replaced by Tara Moore / Eden Silva
Dalila Jakupović / Yana Sizikova → replaced by Sarah Beth Grey / Emily Webley-Smith Ellen Perez / Danielle Collins → replaced by Naiktha Bains / Samantha Murray Sharan Xu Yifan / Zhang Shuai → replaced by Ellen Perez / Zhang Shuai