The 2021 Kelly Cup playoffs of the ECHL began on June 7 following the conclusion of the 2020–21 ECHL regular season, and ended on July 2 with the Fort Wayne Komets winning their first Kelly Cup over the South Carolina Stingrays in four games.
Due to the postseason being pushed later into the year than typical, both the South Carolina Stingrays and Wichita Thunder were forced to play home games out of their practice rinks over scheduling conflicts with their normal home arenas.
[5] Due to the imbalanced scheduling during the pandemic, teams were seeded by points percentage.
[9] GP = Games played; G = Goals; A = Assists; Pts = Points; +/– = Plus/minus; PIM = Penalty minutes This is a combined table of the top five goaltenders based on goals against average and the top five goaltenders based on save percentage, with at least 240 minutes played as of June 30.
[10] GP = Games played; W = Wins; L = Losses; OTL = Overtime Losses; SA = Shots against; GA = Goals against; GAA = Goals against average; SV% = Save percentage; SO = Shutouts; TOI = Time on ice (in minutes)