Mentiri National Housing Area 'A' or Mentiri National Housing Area 1 is a village administrative division in Brunei-Muara District of Brunei. It is a village subdivision of the mukim or subdistrict of Mentiri. As a village, it is headed by a ketua kampung or village head, and the incumbent is Pengiran Aliuddin bin Pengiran Damit. It is also a designated postcode area with the postcode BU2129.