Zamboanga Sibugay's at-large congressional district

Zamboanga Sibugay's at-large congressional district was the lone congressional district of the Philippines in the province of Zamboanga Sibugay for the House of Representatives from 2001 to 2007. It was created after the passage of Republic Act No. 8973 in 2000 which partitioned the province of Zamboanga del Sur and established the province of Zamboanga Sibugay. The district was represented by Belma A. Cabilao for the entirety of its existence. She was redistricted to Zamboanga Sibugay's 1st congressional district after the passage of Republic Act No. 9232 which abolished the district and reapportioned Zamboanga Sibugay into two congressional districts following the 2007 census.

Representation history
{| class=wikitable ! rowspan="2" | # ! rowspan="2" colspan=2 | Member ! colspan=2 | Term of office ! rowspan="2" | Congress ! rowspan="2" | Party ! rowspan="2" | Electoral history !Start!!End
 * colspan="8" style="text-align:center;" |
 * colspan="8" style="text-align:center;" |

Zamboanga Sibugay's at-large district for the House of Representatives of the Philippines

 * colspan="8" style="text-align:center;" | District created November 7, 2000 from Zamboanga del Sur's 3rd district.
 * rowspan="2" style="text-align:center;" | 1
 * rowspan="2" style="background:;" |
 * rowspan="2" | Belma A. Cabilao
 * rowspan="2" | June 30, 2001
 * rowspan="2" | June 30, 2007
 * style="text-align:center;" | 12th
 * rowspan="2" | Lakas–CMD
 * Elected in 2001.
 * style="text-align:center;" | 13th
 * Re-elected in 2004. Redistricted to the 1st district.
 * colspan="8" style="text-align:center;" | District dissolved into Zamboanga Sibugay's 1st and 2nd districts.
 * }
 * Re-elected in 2004. Redistricted to the 1st district.
 * colspan="8" style="text-align:center;" | District dissolved into Zamboanga Sibugay's 1st and 2nd districts.
 * }
 * }