Template:2021 Naisten Liiga playoffs

International travel restrictions and quarantine protocols due to the COVID-19 pandemic necessitated extended travel schedules for national teams competing in the 2021 IIHF Women's World Championship, originally scheduled to begin on 4 April 2021, and the Naisten Liiga playoff structure was modified to conclude a week earlier than expected to accommodate a training camp within the quarantine period for the Finnish national team. On 27 February, it was announced that, in order to name the Finnish Champion by 27 March at the latest, the quarterfinal series were to be reduced from the standard best-of-five system to best-of-three. The best-of-five semifinals and finals and the bronze medal match remain unchanged.

In an unexpected twist, on 4 March the International Ice Hockey Federation (IIHF) announced that the 2021 Women's Worlds were to be postponed until 6–16 May 2021. As the first games of the Naisten Liiga quarterfinals had already been played the day before, the playoff structure announced on 27 February remained in place following announcement of the postponement.