Muntinlupa National High School Tunasan Annex was established through a Resolution No. 11 – 034, a resolution requesting the Hon. Rodolfo Biazon, Representative of the Lone Congressional District of Muntinlupa, to sponsor a Bill in Congress creating a new National High School in Tunasan which was authored by the Hon. Councilor Atty. Raul R. Corro and 16 other city councilors. The bill was resolved and approved by the 6thSangguniangPanglungsod of Muntinlupa on February 14, 2011 headed by the City Mayor Aldrin L. San Pedro.

Muntinlupa National High School Tunasan Annex is the newest public secondary school in the Division of Muntinlupa, located at #22 National Road, Norfil Building, Putatan, MuntinlupaCity. It is headed by Mr. Dean B. Hermoso, Head Teacher VI, Officer-In-Charge. It is about 0.5 meters away from the city proper and it will take five minutes to travel by jeepney or tricycle.

The school was operated last June 04, 2012, with four (4) permanent teachers and four (4) city-paid teachers, funded by the City Government of Muntinlupa. It has also two (2) personnel from the Public Order and Safety Office (POSO) who acts as security guards and peace keepers in the school and with one (1) administrative staff. For this school year 2012-2013, it has 228 Grade 7 students.

For the school year 2013-2014, Muntinlupa National High School-Tunasan Annex catered543 Grade 7 and Grade 8 students. The school will be transferred to its new location after the establishment of the 4-storey building consisting of 52 classrooms located at Laguerta, Tunasan, Muntinlupa City.