Legislative district of the Philippines
Negros Oriental's at-large congressional district was the provincewide electoral district that was used to elect members of Philippine national legislatures in Negros Oriental before 1987.
Negros Oriental first elected its representatives at-large in the 1943 Philippine legislative election for a seat in the National Assembly of the Second Philippine Republic. Before 1943, the province which also included the territory of present-day Siquijor province was represented in the national legislatures through its first and second districts. The province was also earlier represented in the Malolos Congress of the First Philippine Republic in 1898 by appointed delegates residing in Luzon.
The two districts were restored in Negros Oriental ahead of the 1941 Philippine House of Representatives elections whose elected representatives only began to serve following the dissolution of the Second Republic and the restoration of the Philippine Commonwealth in 1945. An at-large district would not be used in the province again until the 1984 Philippine parliamentary election for three seats in the Batasang Pambansa. It became obsolete following the 1987 reapportionment under a new constitution that divided Negros Oriental into three congressional districts.
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