Lanao del Sur's at-large congressional district
Lanao del Sur's at-large congressional district is an obsolete congressional district that encompassed the entire territory of Lanao del Sur in the Philippines. It was represented in the House of Representatives from 1961 to 1972 and in the Regular Batasang Pambansa from 1984 to 1986. The province of Lanao del Sur was created as a result of the division of Lanao in 1959 and elected its first representative provincewide at-large during the 1961 Philippine House of Representatives elections. Rasid Lucman was elected as this district's first representative. The  district remained a single-member district until the dissolution of the lower house in 1972. It was later absorbed by the multi-member Region XII's at-large district for the national parliament in 1978. In 1984, provincial and city representations were restored and Lanao del Sur returned two members for the regular parliament. The district was abolished following the 1987 reapportionment that established two districts in the province under a new constitution.