MLA stands for Member of the Legislative Assembly—the title for elected representatives in the Northern Ireland Assembly, the devolved legislature established under the 1998 Good Friday Agreement.
MLAs are elected via Single Transferable Vote (STV), a form of proportional representation, from 18 multi-member constituencies (each electing 5 MLAs). This system encourages power-sharing and cross-community representation central to the consociational design.
The Assembly comprises 90 MLAs (reduced from 108 in 2017). Parties must designate as "Unionist," "Nationalist," or "Other"—affecting voting weights on cross-community matters requiring parallel consent or weighted majority.
MLAs legislate on transferred matters (health, education, agriculture, justice, environment), scrutinize the Executive (ministers), and represent constituents. The Assembly can be suspended (as occurred 2002–2007, 2017–2020) if power-sharing collapses.
Northern Ireland also elects 18 MPs to the UK Parliament (House of Commons), who handle reserved matters (defense, foreign policy, immigration, fiscal policy). MLAs and MPs are separate roles with different constituencies and responsibilities.