2021 League of Ireland Premier Division

The 2021 League of Ireland Premier Division, known as the SSE Airtricity League Premier Division for sponsorship reasons, was the 37th season of the League of Ireland Premier Division, the top Irish league for association football clubs since its establishment in 1985. Shamrock Rovers were the defending champions, having won their sixth league title the previous season. Shamrock Rovers went on to retain the title.

Impact of the COVID-19 pandemic
Due to the impact of the COVID-19 pandemic on sports in the Republic of Ireland, the FAI met with the National League Executive Committee on 2 January 2021 and a decision was reached to move the start date for the Premier Division until at least 19 March 2021.

Teams
Ten teams compete in the league – the top eight teams from the previous season and the two teams promoted from the First Division. The promoted teams are Drogheda United and Longford Town, after respective top flight absences of four and five years. They replaced Cork City (relegated after nine years in the top flight), and Shelbourne (relegated via play-off after only a year back in the top flight).

Personnel and kits
Note: Flags indicate national team as has been defined under FIFA eligibility rules. Players may hold more than one non-FIFA nationality.

Positions by round
The table lists the positions of teams after each week of matches. In order to preserve chronological evolvements, any postponed matches are not included in the round at which they were originally scheduled but added to the full round they were played immediately afterward.

Results
Teams will play each other four times (twice at home, twice away).

Matches 1–18
*Note Sligo Rovers were awarded a 3–0 victory by the FAI after Waterford opted out of playing the game due to COVID-19 cases in their squad.

Top scorers
Last updated after fixtures on 19 November 2021.

Clean sheets
Last updated after fixtures on 19 November 2021.