|Region||National Capital Region|
|District||1st Legislative district of Muntinlupa|
|Established||June 28, 1964|
|• Barangay Captain||Walter Arcilla|
|• SK Chairperson||Seth Laureta|
|• Total||9.596 km2 (3.705 sq mi)|
|Time zone||UTC+8 (PST)|
1774 (Susana Heights)
|Range||Marikina Valley Fault Ridge|
Tunasan is a barangay in Muntinlupa, Philippines. It is the southernmost barangay of Metro Manila located in the southern section of the city bordering the province of Laguna. The total land area of the barangay is 9.596 km2 (3.705 sq mi), largest in the city. According to the 2020 census, it has a population of 61,374.
Tunasan is located 27 kilometers (17 mi) south of the City of Manila. It is bounded by Poblacion, Muntinlupa on the north, the Laguna de Bay on the east, the San Pedro barangays of San Antonio and Cuyab on the south; the Las Piñas barangay of Almanza Uno on the west; and Dasmariñas barangay of Salapan, province of Cavite, on the southwest.
Tunasan got its name from a medicinal plant locally called tunas (Nymphaea nouchali), which was abundant on the Tunasan River and the shoreline of Laguna de Bay.
There are also three legends or myths that possibly explain the origin of Tunasan's name:
Tunasan was called "Tunasancillo" during the Spanish colonial period and it was a barrio and also a part of the vast hacienda owned by the Augustinian Recollects in the pueblo or town of San Pedro Tunasan in the province of La Laguna. San Pedro Tunasan was later annexed to the town of Biñan in 1903. Eventually, the barrio became part of Muntinlupa, which was then a municipio of the province of Rizal when the town of San Pedro Tunasan sold it in 1907 during the American period. After the separation, the town of San Pedro Tunasan simply changed its name to San Pedro and the sold barangay of Tunasancillo was called Tunasan.
While barangays are the administrative divisions of the city, and are legally part of the addresses of establishments and homes, residents also include their subdivision. Listed below are subdivisions in this barangay.
SM Development Corporation donated an 8,348-square-meter (89,860 sq ft) property in Laguerta, Barangay Tunasan for residential use . Several government offices and buildings are also planned in this area.
The Tunasan Baywalk is a reclaimed area behind the Muntinlupa Science High School where the Muntinlupa Sports Complex is located.