2021 Women's Premiership (Northern Ireland)

The 2021 Northern Irish Women's Premiership, was the 18th season of the top-tier women's football league in Northern Ireland. Glentoran were the defending champions.

Glentoran won their ninth league title, and second consecutive title, after a 3–2 home victory over Cliftonville in the penultimate round of fixtures on 21 September 2021.

For the 2021 season, no team was relegated as the league was to increase to eight teams for the 2022 season with a view to making the league professional in the 2023 season.

Teams and locations
The following teams made up the 2021 season.

Teams are listed in alphabetical order.