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The 2021 CSA Champions League was the 8th season of the CSA's premier club football tournament organized by the CSA.

The final was played at the Octan Stadium in Bricksburg, Canada, between Berry Bitty City CSC and the defending champion Lego City Huskies. Berry Bitty City CSC won the match 4–0 to claim their first Champions League title. The win gave Berry Bitty City automatic qualification for the 2022 CSA Champions League group stage and the right to play in the 2022 CSA Super Cup.

Format changes
On 9 October 2019, the CSA confirmed the reforming plan for the CSA Champions League for 2020 and beyond, which was announced on 26 August 2019. As per the new regulations, the previous season's CSA Super League winners will qualify automatically for the CSA Champions League group stage. Meanwhile, the top four teams from all CSA leagues will qualify automatically for the group stage as well. Seven teams will qualify for the group stage via the qualification rounds.

Teams
CL: Champions League title holders

SL: Super League title holders

Round and draw dates
The schedule of the competition was as follows (all draws were held at the CSA headquarters in Madawaska, Maine). For this season, there were staggered kick-off times in the group stage at 18:00 EST and 20:00 EST. Kick-off times starting from the knock-out phase were 18:00 EST.

Qualifying rounds
In the qualifying rounds, teams are divided into pots based on their league, and then drawn into two-legged home-and-away ties.

First qualifying round
The draw for the first qualifying round was held on 1 April 2021. The first legs were played on 7 and 8 April, and the second legs were played on 21 and 22 April. The losers entered the 2021 CSA Super League qualifying round.

Second qualifying round
The draw for the first qualifying round was held on 1 May 2021. The first legs were played on 5 and 13 May, and the second legs were played on 19 and 27 May 2021. The losers entered the 2021 CSA Super League group stage.

Knockout phase
In the knockout phase, teams play against each other over two legs on a home-and-away basis, except for the one-match final.

Final
The final was played on 6 December 2020 at the AstorTrust Stadium in Astor City. The "home" team (for administrative purposes) was determined by a draw held after the semi-final.