|Region||National Capital Region|
|Established||August 21, 1961|
|• Barangay captain||Regine C. San Miguel|
|• Total||1.66 km2 (0.64 sq mi)|
|• Density||7,209/km2 (18,670/sq mi)|
|Time zone||UTC+8 (PST)|
Mariana, is an administrative division in eastern Metro Manila, the Philippines. It is an urban barangay in Quezon City in a middle class residential and commercial area known as New Manila, which includes Barangay Mariana and the adjacent Barangay Damayang Lagi.
The barangay's land boundaries are defined by the España Boulevard Extension (now E. Rodriguez Sr. Avenue), Ilang-ilang Street, Rosario Drive, Victoria Avenue, and Aurora Boulevard, while its water boundaries are defined by the Salapan Creek (also known as the Ermitaño Creek).
It is bordered by Barangay Damayang Lagi to the west, Barangays Kalusugan, and Kristong Hari to the north, Barangay Immaculate Concepcion to the east, Barangays Kaunlaran and Valencia to the south, and San Juan's Barangay Ermitaño to the southwest.
In the 1920s, Lebanese immigrant Doña Magdalena Hemady purchased 1,000 ha (10 km2) of land from friar lands. Among these friar lands was land owned by the Ortigas family, which was previously owned by the Augustinian Order as the Hacienda de Mandaluyon.
Around 1922 to 1923, Doña Hemady developed the land into the New Manila Subdivisions, becoming the first real estate developer in the country, and establishing what would be the first gated community outside of the City of Manila. At some point, New Manila ceased to exist as a gated community and was completely opened to outside traffic, with only some roads remaining gated at certain hours of the day.
The migration of middle-class families towards new suburban developments outside of the City of Manila resulted in available housing in the New Manila area to reach its peak by the 1970s, and so by the 1980s, many of the original, large suburban houses were replaced by higher density developments such as townhouses, condominiums, and mixed-use complexes.
Barangay Mariana was established as Barrio Mariana in 1961 through Quezon City Ordinance No. 4816. It was named after Mariana Wilson, one of the original residents of the New Manila area who was known among its residents for spearheading many of social activities within the community.
Mariana has a grid road layout, with its latitudinal roads named numerically, and its longtitudinal roads serving as main thoroughfares. Victoria Avenue, Broadway Avenue, Gilmore Avenue, Doña Hemady Avenue, and Balete Drive serve as north-south thoroughfares within the area, while E. Rodgriguez Sr. Avenue and Aurora Boulevard serves as outlying east-west thoroughfares.
All roads in the barangay are two-lane roads. Victoria Avenue, Broadway Avenue, and Balete Drive run in a two-way direction while Gilmore Avenue runs in a one-way direction going south, and Doña Hemady Avenue runs in a one-way direction going north.
Bus Route 10 (Cubao-Doroteo Jose) serves the Aurora Boulevard area with stops at Betty Go-Belmonte Street, Robinsons Magnolia, Gilmore Avenue, and Madison Street while Bus Route 11 (Taytay-Gilmore) has its west terminus along Gilmore Avenue in the adjacent Barangay Valencia. Jeepneys run along E. Rodriguez Avenue with routes going to and from Manila, Cubao, and the Tomas Morato Avenue area. Tricycles ply the New Manila area directly through New Manila Tricycle Operators and Drivers' Association (TODA) terminals located at Madison Street and at 3rd Street corner Gilmore Avenue.
Mariana is served by Gilmore Station and Betty Go-Belmonte Station of the LRT Line 2.
The seat of government of Mariana is located at 4th Street corner New Jersey Street, a compound which also includes the barangay's multi-purpose facilities and materials recovery facility.
Barangay Mariana is the 56th most-populated barangay in Quezon City, with a population of 11,967 people according to the 2020 census, up from a population of 11,227 people in the 2015 census.
The insignia of the barangay seal is a green mango, owing to the prominence of mango trees planted along Gilmore Avenue and Broadway Avenue that were originally planted by Doña Hemady and her laborers.