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.

Jimmy White was the defending champion, having won the 2020 edition with a 5–4 victory against Ken Doherty in the final.

The 2021 World Seniors Championship was a snooker tournament that took place from 6 to 9 May 2021 at the Crucible Theatre in Sheffield, England.

The 12th edition of the World Seniors Championship, first contested in 1991,[1] it was held at the Crucible for the third consecutive year and sponsored for the third time by ROKiT.

[2] Alongside him, five former world champions—Doherty, Stephen Hendry, John Parrott, Joe Johnson and Dennis Taylor—were invited to take part in the tournament.

[2] 1980 world champion Cliff Thorburn was replaced by Patsy Fagan, who had won the 1977 UK Championship; Tony Drago, the 1997 International Open runner-up, was replaced by Tony Knowles, and Igor Figueiredo took Bob Chaperon's place.

[3] The field was completed by Michael Judge, Barry Pinches, David Lilley, Darren Morgan, Philip Williams and Patrick Wallace.

[5] In a repeat of one of the 1994 World Snooker Championship semi-finals, White faced Morgan, who made a 134, his second century of the event and what would remain as the highest break of the tournament.

[9][7][3] The fifth frame saw half-centuries by both players, but it was Figueiredo who potted the final black ball and prevailed with a 72‍–‍62 result and advanced into the semi-finals.