Rizal's 1st congressional district is one of the four congressional districts of the Philippines in the province of Rizal. It has been represented in the House of Representatives of the Philippines since 1916 and earlier in the Philippine Assembly from 1907 to 1916.^[3] The district consists of the western Rizal municipalities of Angono, Binangonan, Cainta and Taytay. It is presently the largest legislative district in the country in terms of population. It is currently represented in the 19th Congress by Michael John R. Duavit of the Nationalist People's Coalition (NPC).^[4]

Prior to its second dissolution in 1972, the district encompassed the former western Rizal municipalities and cities of Caloocan, Las Piñas, Makati, Malabon, Mandaluyong, Muntinlupa, Navotas, Parañaque, Pasay, Pateros, San Juan, and Taguig, as well as the western part of Quezon City, which had previously belonged to Caloocan and San Juan; such area now forms the majority of the present-day Metro Manila. After the creation of Metro Manila in 1975, it encompassed Antipolo and the southwestern part of the reduced province of Rizal beginning in 1987. In 1998, Antipolo was separated from the district to form its own representation as a newly converted city, leaving the four remaining municipalities in its current jurisdiction.^[5]

• Legislative districts of Rizal