Zamboanga del Sur's at-large congressional district is an obsolete congressional district that encompassed the area of Zamboanga del Sur in the Philippines.
[1] The province of Zamboanga del Sur was created as a result of the partition of Zamboanga in 1952 and elected its first representative provincewide at-large during the 1953 Philippine House of Representatives elections.
[2] Roseller T. Lim, who served as representative of Zamboanga's at-large congressional district during the partition, was this district's first representative.
It was later absorbed by the multi-member Region IX's at-large district for the national parliament in 1978.
[1] In 1984, provincial and city representations were restored and Zamboanga del Sur elected three members for the regular parliament with a separate representation created for Zamboanga City.