The Metropolitan Manila Development Authority (MMDA; Filipino: Pangasiwaan sa Pagpapaunlad ng Kalakhang Maynila) is a government agency of the Philippines responsible for constituting the regional government of Metro Manila, comprising the capital city of Manila, the cities of Quezon City, Caloocan, Pasay, Mandaluyong, Makati, Pasig, Marikina, Muntinlupa, Las Piñas, Parañaque, Valenzuela, Malabon, Taguig, Navotas and San Juan, and the municipality of Pateros.

[6] The office was located in front of the present-day GMA Network at EDSA corner Timog Avenue in Diliman, Quezon City.

392, in accordance to Article 18, Section 8 of the 1987 Philippine Constitution which replaced the commission with the Metropolitan Manila Authority (MMA).

The agency transferred to its office at the intersection of Epifanio de los Santos Avenue (EDSA) and Orense Street in Guadalupe Nuevo, Makati.

[citation needed] Since the elected chairman is one of the mayors of Metro Manila, the role to their constituency gave less attention.

[citation needed] In August 2017, the MMDA has adopted the use of a black beret in order to improve its public image.

On May 23, 2022, President Rodrigo Duterte inaugurated the new headquarters of the MMDA at the intersection of Doña Julia Vargas Avenue and Molave Street in Ugong, Pasig.

[2] The governing board and policy making body of the MMDA is the Metro Manila Council, composed of the mayors of the cities and municipalities.

To compensate for the closure of these communication mediums, the MMDA turned to social media such as Twitter to broadcast traffic updates to users following them.

Since 2014, the agency took over the mothballed Pasig River ferry system in anticipation of huge traffic along the metropolis, from the Skyway Stage 3 construction.

Ridership of the waterway service increased over time since the agency's takeover, with the offering of discounts to students and senior citizens, until these were made totally free of charge.

[17][18] The MMDA under Bayani Fernando implemented a "no left-turn" scheme in the early 2000s along several major roads in Metro Manila, prohibiting motor vehicle traffic from turning left at intersections and instead requiring them to make a U-turn at designated U-turn slots and making a right turn after.

Several academic studies also summarized that the "no left-turn" design was only beneficial under low traffic conditions and minimal lane changing, as the U-turn slots also became congested themselves.

The MMDA operates and maintains several pumping stations in strategic areas of Metro Manila with the aim of mitigating flooding risks, especially during inclement weather.

The Court of Appeals says the MMDA is not among the government agencies deputized to implement RA 9211 or the Tobacco Regulation Act of 2003.

Various government agencies, educational institutions and the private sector participated in the drill spearheaded by the Metropolitan Manila Development Authority (MMDA).

Different scenarios were re-enacted to simulate a destructive earthquake that is expected to happen when the 100-kilometer (62 mi) West Valley Fault moves.

Advocacy groups contend that in seeking to create a beautiful metropolis, the MMDA often treat Metro Manila's urban poor like 'rubbish' on the street.

[28] The MMDA clarified that the height of the footbridge was designed to conform to the 5-meter (16 ft) vertical clearance from the at-grade MRT-3's overhead catenary wires on the EDSA median.