Marble League 2021 will be the sixth edition of the Marble League.
The Savage Speeders are the defending champions, having won their second title in 2020.
- Main article: Marble League 2021 Practice Race
Before the qualifiers, a practice sand race including all 28 teams was held. The Jawbreakers and Hornets were present instead of Gliding Glaciers and Solar Flares, as it also served as a farewell race for the two teams.
- Main article: Marble League 2021 Qualifiers
- Main article: Marble League 2021 Friendly Round
Before Marble League 2021 starts, there will be a friendly round between the hosts and the pre-qualified teams.
|Qualified Teams||Method of Qualification||Date of Qualification||Marble League Appearance|
|Savage Speeders||Marble League 2020 Champion||13 August 2020||6th|
|O'rangers||Marble League 2020 Runners-up||16 August 2020||6th|
|Minty Maniacs||Marble League 2020 Third Place||16 August 2020||3rd|
|Crazy Cat's Eyes||Hosts||16 August 2020||4th|
- Main article: Marble League Showdown 2021
The twelve teams that fail to qualify for Marble League 2021 will be entered into Marble League Showdown 2021.