South Cotabato's at-large congressional district is a defunct congressional district that encompassed the entire province of South Cotabato in the Philippines.
[1] The province of South Cotabato was created as a result of the partition of Cotabato in 1966 and elected its first representative provincewide at-large during the Philippine House of Representatives special election of November 14, 1967.
[2] It covered the combined territories of the present-day South Cotabato and Sarangani provinces including the now-independent city of General Santos.
It was later absorbed by the multi-member Region XI's at-large district for the national parliament in 1978.
[1] In 1984, provincial and city representations were restored and South Cotabato elected three members for the regular parliament.