The Legislative Assembly of New Brunswick is the deliberative assembly of the New Brunswick Legislature, in the province of New Brunswick, Canada. The assembly's seat is located in Fredericton. It was established in Saint John de jure when the colony was created in 1784 but came into session only in 1786, following the first elections in late 1785. The legislative assembly was originally the lower house in a bicameral legislature. Its upper house counterpart, the Legislative Council of New Brunswick, was abolished in 1891. Its members are called "Members of the Legislative Assembly", commonly referred to as "MLAs".

Fredericton is the capital city of the Canadian province of New Brunswick. The city is situated in the west-central portion of the province along the Saint John River, also known by its Indigenous name of Wolastoq, which flows west to east as it bisects the city. The river is the dominant natural feature of the area. One of the main urban centres in New Brunswick, the city had a population of 63,116 and a metropolitan population of 108,610 in the 2021 Canadian census. It is the third-largest city in the province after Moncton and Saint John.