San Juan–Mandaluyong's at-large congressional district
San Juan–Mandaluyong's at-large congressional district was the combined representation of the Metro Manila municipalities (now highly urbanized cities) of Mandaluyong and San Juan in the Regular Batasang Pambansa (1984–1986) and the lower house of the Congress of the Philippines (1987–1995).
Since 1995, the cities of Mandaluyong and San Juan have been represented separately through their respective lone congressional districts: Mandaluyong and San Juan. This separation followed the enactment of Republic Act No. 7675 and its approval by plebiscite on April 4, 1994, which converted Mandaluyong into a highly urbanized city. Per Section 49 of Republic Act No. 7675, Mandaluyong was established as its own congressional district, thereby granting San Juan separate representation as well. Both cities elected their respective representatives in the 1995 elections.