Local elections were held in Northern Ireland on 18 May 2023. The elections were delayed by two weeks to avoid overlapping with the coronation of King Charles III. Following the elections, Sinn Féin became the largest party in local government for the first time. It also marked the first time that nationalist parties had garnered a greater share of the vote than unionist parties, however, despite this, there were more unionist councillors elected than nationalists.

Aontú is an all-Ireland political party that was formally launched in January 2019, and operates in both the Republic of Ireland and Northern Ireland. Ideologically, Aontú is opposed to abortion and combines elements of social conservatism with advocacy for a united Ireland and centre-left economics. It has been led by Peadar Tóibín since its foundation.