| Date: | 14–20 June |
| Edition: | 118th |
| Draw: | 32 / 24 |
| Surface: | Grass |
| Category: | ATP Tour 500 series |
| Location: | London, United Kingdom |
| Venue: | Queen's Club |
| Champs: |  Matteo Berrettini |
| Champd: |  Pierre-Hugues Herbert / Nicolas Mahut |
| Champwcs: |  Gordon Reid |
| Champwcd: |  Joachim Gérard /  Stefan Olsson |
| Main Name: | Queen's Club Championships |
| Before Year: | 2019 |
The 2021 Queen's Club Championships (also known as the cinch Championships for sponsorship reasons) was a tennis tournament played on outdoor grass courts at the Queen's Club in London, United Kingdom from 14 to 20 June 2021.[1] It was the 118th edition of the event and part of the ATP Tour 500 series of the 2021 ATP Tour.
See main article: 2021 Queen's Club Championships – Singles.
Matteo Berrettini defeated Cameron Norrie, 6–4, 6–7(5–7), 6–3See main article: 2021 Queen's Club Championships – Doubles.
Pierre-Hugues Herbert / Nicolas Mahut defeated 
Reilly Opelka / 
John Peers, 6–4, 7–5.See main article: 2021 Queen's Club Championships – Wheelchair singles.
Gordon Reid defeated 
Gustavo Fernández, 6–2, 6–2 Joachim Gérard / Stefan Olsson defeated Tom Egberink / Gustavo Fernández, 1–6, 7–6(7–4), [10–6]| Event | W | F | SF | QF | Round of 16 | Round of 32 | Round of 64 | width=85 | Q | width=85 | Q2 | width=85 | Q1 |
| Singles[2] | 500 | 300 | 180 | 90 | 45 | 20 | 0 | 10 | 4 | 0 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubles | 0 | 45 | 25 |
| Event | W | F | SF | QF | Round of 16 | Round of 32 | width=85 | Q2 | width=85 | Q1 |
| Singles | €113,785 | €84,075 | €59,860 | €40,765 | €25,480 | €14,650 | €6,750 | €3,565 | ||
| Doubles* | €40,200 | €30,240 | €21,760 | €14,340 | €9,020 | €5,000 |
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| Italy | Matteo Berrettini | 9 | 1 |
 Canada | Denis Shapovalov | 14 | 2 |
| Italy | Jannik Sinner | 19 | 3 |
| Australia | Alex de Minaur | 22 | 4 |
 Russian Federation | Aslan Karatsev | 26 | 5 |
| United Kingdom | Dan Evans | 27 | 6 |
| Italy | Lorenzo Sonego | 28 | 7 |
| Italy | Fabio Fognini | 29 | 8 |
The following players received wildcards into the main draw:
The following player received entry using a protected ranking:
The following players received entry from the qualifying draw:
The following player received entry as a lucky loser:
Alejandro Davidovich Fokina → replaced by Jérémy Chardy Milos Raonic → replaced by Frances Tiafoe
Filip Krajinović → replaced by Alejandro Tabilo Diego Schwartzman → replaced by Alexei Popyrin Feliciano LópezThe following pairs received wildcards into the doubles main draw:
The following pair received entry as an alternate:
John-Patrick Smith
Alexander Bublik / Taylor Fritz → replaced by Alexander Bublik / Nicholas Monroe Alejandro Davidovich Fokina / Albert Ramos Viñolas → replaced by Aljaž Bedene / Albert Ramos Viñolas Feliciano López → replaced by Feliciano López / Jannik Sinner Laslo Đere / Filip Krajinović → replaced by John Millman / 
Artem Sitak
Henri Kontinen / Édouard Roger-Vasselin → replaced by Luke Bambridge / Dominic Inglot
Colombia
Brazil