| Tournament information | |
|---|---|
| Dates | 6–9 May 2021 |
| Venue | Crucible Theatre |
| City | Sheffield |
| Country | England |
| Organisation | World Seniors Snooker |
| Format | Seniors event |
| Winner's share | £15,000 |
| Highest break |  Darren Morgan (WAL) (134) |
| Final | |
| Champion |  David Lilley (ENG) |
| Runner-up | Jimmy White (ENG) |
| Score | 5–3 |
← 2020 2022 → | |
The 2021 World Seniors Championship (officially the 2021 ROKiT World Seniors Snooker Championship) was an invitational senior snooker tournament that took place from 6 to 9 May 2021 at the Crucible Theatre in Sheffield, England, the third consecutive year that the tournament was held at the venue. Open to all players over 40 who were ranked outside the top 64 in the snooker world rankings, the event was the 12th edition of the World Seniors Championship, first held in 1991. Organised by the World Seniors Tour, the event was broadcast domestically by the BBC and internationally by other broadcasters.
The main stage featured 16 competitors. Former world champions Ken Doherty, Stephen Hendry, John Parrott, Joe Johnson and Dennis Taylor were among the invited players. COVID-19 travel restrictions meant that three of the players originally invited—1980 world champion Cliff Thorburn, Tony Drago and Bob Chaperon—were unable to take up their places. 1977 UK champion Patsy Fagan, former world number two Tony Knowles and WSF Seniors champion Igor Figueiredo were chosen to replace them.
Jimmy White was the defending champion, having won the 2020 edition with a 5–4 victory against Ken Doherty in the final. White reached the final for the third year in a row, but lost 5–3 to David Lilley, who won the title for the first time and thus qualified for the 2021 Champion of Champions.