San Mateo National High School (SMNHS) is a government-funded secondary educational institution located in the Municipality of San Mateo, Rizal in the Philippines.

Established in 1985, the school started with 90 first year students with only 5 teachers through the approval of a temporary permit #73. Soon, the exceedingly large number of enrollees in the next school year, 1986–87 paved the way for the hiring of more teachers and non-teaching personnel.

San Mateo Municipal High School was converted to a National High School under the management of Juana M. Garrovillas who served as the principal from 1988 to 2000.

The first annex was established in 1994 pursuant to R.A. # 6655 addressing the growing need of the barangay for a public school in Barangay Silangan, San Mateo, Rizal. The annex started with one section of first year. When the AFP Retirement and Separation Benefit System granted the deed of donation on March 22, 1997, providing their own school site, Silangan Annex was separated from the main. It was therefore renamed, Silangan National High School. Later, another annex was founded, the Sto. Niño Annex, to address the growing population of Barangay Sto. Niño. In 2006, this annex was declared as an Independent School, presently known as Sto. Niño National High School.

In School Year 2014-2015 San Mateo National High School commenced the Special Science curriculum to the K–12 Basic Education Curriculum.

• Grade 11
• Grade 12

• Grade 7-10

• • STEM (Science, Technology, Engineering, Mathematics)
  • GAS (General Academic Strand)
  • HUMMS (Humanities and Social Sciences)
  • ABM (Accountancy, Business, Management)
  • TVL (Technical-Vocational-Livelihood Track)
  • ICT (Information Communication and Technology) or ICT Strand

• Dr. Elvira R. Conese - 2021–Present
• Mr. Absalon C. Fernandez - 2015–2021
• Ms. Juana M. Garrovillas - 2014–2015
• Dr. Vidal F. Mendoza - 2007–2014
• Mrs. Remedios C. Gervacio - 2000–2007
• Mrs. Corazon Laserna - 2000
• Ms. Juana M. Garrovillas - 1988–2000
• Mrs. Leticia Bautista - 1987–1988
• Dr. Crisanto Rivera - 1986–1987

• Jerwin Gaco, PBA Basketball Player, notably in San Mig Coffee Mixers

• Education in the Philippines

• Philippines Department of Education