The 2021 Malaysia Super League (), was the 18th season of the Malaysia Super League, the top-tier professional football league in Malaysia.
The defending champions from the 2020 Malaysia Super League season, Johor Darul Ta'zim, have managed to defend their title, securing their 8th consecutive title (since 2014) on 28 August 2021 although having 2 more matches left. On the other hand, Kedah who became the runner-ups have qualified to the 2022 AFC Cup. Penang who got third was a standby team for the AFC Cup and would qualify if the winners of the 2021 Malaysia Cup went to the Johor or Kedah, but they failed to and Kuala Lumpur City who became the champions ended up taking the spot.
The following teams have changed division.
Promoted from Premier League
Relegated to Premier League
Disbanded Team
Renamed/Rebranded Clubs
<section begin=map /><section end=map />
<small>Note: Flags indicate national team as has been defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.</small>
Southeast Asia (SEA) players are required to have acquired at least 30 international caps for their senior national team with no period restriction on when they are earned while those who has less than 30 international caps will be subjected to MFL approval.
<small>Note: Flags indicate national team as defined under FIFA eligibility rules. Players may hold more than one FIFA and non-FIFA nationality.</small>
<small>Notes:</small>
<onlyinclude> </onlyinclude>
The table lists the positions of teams after each week of matches.<br>In order to preserve chronological evolvements, any postponed matches are not included to the round at which they were originally scheduled but added to the full round they were played immediately afterward.
Notes (H) â Home team (A) â Away team