Newry, Mourne and Down District Council (Irish: Comhairle Ceantair an Iúir, Mhúrn agus an Dúin) is a local authority in Northern Ireland that was established on 1 April 2015. It replaces Down District Council and Newry and Mourne District Council and covers most of the southeast of Northern Ireland. The first elections to the authority were on 22 May 2014. At the 2019 Northern Ireland local elections, Sinn Féin became the largest party with 16 seats. This success was continued at the 2023 Northern Ireland local elections, winning 20 seats.
