The 38-game season commenced on 16 October 2020 and concluded on 29 May 2021, with the European play-offs then taking place on 1 and 5 June 2021. The fixtures were released on 19 September 2020.
Linfield were the two-time defending champions, having been league winners in the previous two seasons - the
curtailed 2019–20 season seeing them win a then world record-equalling 54th league title. This season Linfield won a third consecutive title, once again equalling the world record for the most top flight league titles in club football, drawing level with
Rangers, who had just won their 55th Scottish title two months earlier. Linfield entered the
2021–22 UEFA Champions League first qualifying round, while runners-up
Coleraine and 3rd-placed
Glentoran joined the European play-off winners,
Larne, in the
2021–22 UEFA Europa Conference League first qualifying round. There was no relegation from the Premiership this season, after a majority of
NIFL Championship clubs voted to cancel their 2020–21 season, having not played any league fixtures since the 2019–20 season had initially been suspended in March 2020. The second and third tiers had not been granted 'elite' sporting status by the
IFA which was required in order to continue playing matches during the COVID-19 pandemic lockdown. ==Teams==