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| Tournament information | |
|---|---|
| Dates | 18 July – 13 August 2021 |
| Venue | Morningside Arena |
| City | Leicester |
| Country | England |
| Organisation | Matchroom Sport |
| Format | Ranking event |
| Total prize fund | £328,000 |
| Winner's share | £33,000 |
| Highest break |  Mark Allen (NIR) (146) |
| Final | |
| Champion |  David Gilbert (ENG) |
| Runner-up | Mark Allen (NIR) |
| Score | 3–1 |
The 2021 Championship League was a professional ranking snooker tournament that took place from 18 July to 13 August 2021 at the Morningside Arena in Leicester, England. The event featured 128 players and was played as three rounds of round-robin groups of four, before a best-of-five final. It was the 17th edition of the Championship League and the first ranking tournament of the 2021–22 snooker season. It was one of two Championship League events held over the season, with a following invitational event held as the 2022 Championship League (invitational).
Kyren Wilson was the defending champion, having defeated Judd Trump 3–1 in the final of the September to October 2020 edition of the tournament. Wilson's title defence ended in Stage Three, where he finished third in his group. David Gilbert won the tournament, defeating Mark Allen 3–1 to win his first ranking title. Allen made the highest break of the event, a 146.