Sulu's at-large congressional district may refer to several instances when a provincewide at-large district was used for elections to Philippine national legislatures from the province of Sulu before 1987.
Datu Ombra Amilbangsa of the Nacionalista Democrático was elected as the district's first representative in 1935 by a select group of electors composed of municipal and municipal district presidents, vice-presidents and councilors, among others.[5][6] The first time a representative from the province was elected through popular vote was during the succeeding 1938 Philippine legislative election after the passage of Commonwealth Act No. 44 in 1936 which removed the restrictions on qualified voters in the former Bureau of Non-Christian Tribes-designated jurisdiction.[7]
Sulu was also represented in the Second Republic National Assembly by two members during the Pacific War. It reverted to single-member representation for the restored Commonwealth and subsequent Third RepublicHouse of Representatives. It continued to elect representatives until the dissolution of Congress in 1972. Following a shift to parliamentary system, districts were replaced by multi-member regional constituencies where Sulu, reduced to the Jolo island group following the separation of Tawi-Tawi in 1973, was represented as part of Region IX's at-large district.[8] When provincial and city district representation was restored in 1984, Sulu was represented by one assemblyman, with a separate representation created for Tawi-Tawi.[9][5] It was made obsolete by the 1987 reapportionment that established two districts in the province under a new constitution.[10]