- Source: 2021 RFL Championship season results
The Rugby Football League (RFL) 2021 Championship comprised 22-rounds in the regular season with a four-round play-off post-season contested by the top six clubs to determine which club would be promoted to the 2022 Super League.
Regular season
= Round 1
== Round 2
== Round 3
== Round 4
== Round 5
== Round 6
=Limited attendances by home supporters only were allowed from Monday 17 May 2021.
= Round 7
== Round 8
== Round 9
== Round 10
== Round 11
== Round 12
== Round 13
== Round 14
== Round 15
== Round 16
== Round 17
== Round 18
== Round 19
== Round 20
== Round 21
== Round 22
=Play-offs
Similar to the Super League, the teams who finished first and second respectively on the regular season table (Toulouse Olympique and Featherstone Rovers respectively, had byes to the semi-finals. The four teams who finish third to sixth contested in the two eliminator play-offs, with the winner of those two games moving on to the semi-finals (Halifax Panthers and Batley Bulldogs respectively).