Negros Oriental's at-large congressional district

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.

Representation history
{| class=wikitable ! rowspan=2 | # ! colspan=2 | Term of office ! rowspan=2 | National Assembly ! colspan=4 | Seat A ! colspan=4 | Seat B ! colspan=4 | Seat C !Start!!End ! colspan="2" style="text-align:center;" | Member ! Party ! Electoral history ! colspan="2" style="text-align:center;" | Member ! Party ! Electoral history ! colspan="2" style="text-align:center;" | Member ! Party ! Electoral history
 * rowspan=2 |
 * rowspan=2 |
 * rowspan=2 |
 * - style="height:3em"
 * colspan="19" style="text-align:center;" |
 * colspan="19" style="text-align:center;" |

Negros Oriental's at-large district for the Malolos Congress
! rowspan=2 | # ! colspan=2 | Term of office ! rowspan=2 | National Assembly ! colspan=4 | Seat A ! colspan=4 | Seat B !Start!!End ! colspan="2" style="text-align:center;" | Member ! Party ! Electoral history ! colspan="2" style="text-align:center;" | Member ! Party ! Electoral history
 * colspan="19" style="text-align:center;" | District created June 18, 1898.
 * - style="height:3em"
 * style="text-align:center;" | –
 * September 15, 1898
 * March 23, 1901
 * style="text-align:center;" | 1st
 * style="background:;" |
 * Mariano Oriola
 * Independent
 * Appointed.
 * style="background:;" |
 * Pío del Pilar
 * Independent
 * Appointed.
 * style="background:;" |
 * Luciano San Miguel
 * Independent
 * Appointed.
 * style="background:;" |
 * Luciano San Miguel
 * Independent
 * Appointed.
 * Appointed.
 * rowspan=2 |
 * rowspan=2 |
 * rowspan=6 colspan=5 style="text-align:center;" | Seats eliminated
 * - style="height:3em"
 * colspan="14" style="text-align:center;" |
 * colspan="14" style="text-align:center;" |

Negros Oriental's at-large district for the National Assembly (Second Philippine Republic)
! rowspan=2 | # ! colspan=2 | Term of office ! rowspan=2 | Batasang Pambansa ! colspan=4 | Seat A ! colspan=4 | Seat B ! colspan=4 | Seat C !Start!!End ! colspan="2" style="text-align:center;" | Member ! Party ! Electoral history ! colspan="2" style="text-align:center;" | Member ! Party ! Electoral history ! colspan="2" style="text-align:center;" | Member ! Party ! Electoral history
 * colspan="14" style="text-align:center;" | District re-created September 7, 1943.
 * style="text-align:center;" | –
 * September 25, 1943
 * February 2, 1944
 * style="text-align:center;" | 1st
 * style="background:;" |
 * Julián L. Teves
 * KALIBAPI
 * Elected in 1943.
 * style="background:;" |
 * Guillermo Z. Villanueva
 * KALIBAPI
 * Appointed as an ex officio member.
 * colspan="14" style="text-align:center;" | District dissolved into Negros Oriental's 1st and 2nd districts.
 * Guillermo Z. Villanueva
 * KALIBAPI
 * Appointed as an ex officio member.
 * colspan="14" style="text-align:center;" | District dissolved into Negros Oriental's 1st and 2nd districts.
 * colspan="14" style="text-align:center;" | District dissolved into Negros Oriental's 1st and 2nd districts.
 * rowspan=2 |
 * rowspan=2 |
 * rowspan=2 |
 * - style="height:3em"
 * colspan="19" style="text-align:center;" |
 * colspan="19" style="text-align:center;" |

Negros Oriental's at-large district for the Regular Batasang Pambansa

 * colspan="19" style="text-align:center;" | District re-created February 1, 1984.
 * - style="height:3em"
 * style="text-align:center;" | –
 * July 23, 1984
 * March 25, 1986
 * style="text-align:center;" | 2nd
 * style="background:;" |
 * Ricardo D. Abiera
 * KBL
 * Elected in 1984.
 * style="background:;" |
 * Andres C. Bustamante
 * KBL
 * Elected in 1984.
 * style="background:;" |
 * Emilio Macias
 * KBL
 * Elected in 1984.
 * colspan="19" style="text-align:center;" | District dissolved into Negros Oriental's 1st, 2nd and 3rd districts.
 * }
 * KBL
 * Elected in 1984.
 * colspan="19" style="text-align:center;" | District dissolved into Negros Oriental's 1st, 2nd and 3rd districts.
 * }
 * }