| Ilocos Sur Provincial Board | |
| Native Name: | Sangguniang Panlalawigan ng Ilocos Sur |
| Term Limits: | 3 terms (9 years) |
| House Type: | Unicameral |
| Leader1: | Ryan Luis Singson |
| Leader1 Type: | Presiding Officer |
| Party1: | Bileg Ti Ilokano |
| Election1: | June 30, 2022 |
| Members: | 14 board members 1 ex officio presiding officer |
| Structure1: | File:Ilocos Sur Provincial Board composition.svg |
| Structure1 Res: | 200 |
| Structure1 Alt: | Ilocos Sur Provincial Board composition |
| Political Groups1: | NPC (7) Bileg (4) KBL (1) Nonpartisan (3) |
| Term Length: | 3 years |
| Authority: | Local Government Code of the Philippines |
| Voting System1: |
|
| Last Election1: | May 9, 2022 |
| Next Election1: | May 12, 2025 |
| Session Room: | File:Ilocos Sur Capitol 2015.JPG |
| Session Res: | 200px |
| Meeting Place: | Ilocos Sur Capitol, Vigan |
The Ilocos Sur Provincial Board is the Sangguniang Panlalawigan (provincial legislature) of the Philippine province of Ilocos Sur.
The members are elected via plurality-at-large voting: the province is divided into two districts, each having five seats. A voter votes up to five names, with the top five candidates per district being elected. The vice governor is the ex officio presiding officer, and only votes to break ties. The vice governor is elected via the plurality voting system province-wide.
The districts used in appropriation of members is coextensive with the legislative districts of Ilocos Sur.
Aside from the regular members, the board also includes the provincial federation presidents of the Liga ng mga Barangay (ABC, from its old name "Association of Barangay Captains"), the Sangguniang Kabataan (SK, youth councils) and the Philippine Councilors League (PCL). Ilocos Sur's provincial board also has a reserved seat for its indigenous people (IPMR).
| Elections | Seats per district | Ex officio seats | Reserved seats | Total seats | ||
|---|---|---|---|---|---|---|
| 1st | 2nd | |||||
| 2010–2019 | 5 | 5 | 3 | — | 13 | |
| 2019–present | 5 | 5 | 3 | 1 | 14 | |
These are the members after the 2022 local elections and 2023 barangay and SK elections:
| District | Board member | Party | Start of term | End of term | ||
|---|---|---|---|---|---|---|
| 1st | Efren Rafanan | KBL | June 30, 2016 | June 30, 2025 | ||
| 1st | Ronnie Rapanut | Bileg | June 30, 2016 | June 30, 2025 | ||
| 1st | Christopher Baterina | Bileg | June 30, 2016 | June 30, 2025 | ||
| 1st | Constante Oandasan | Bileg | June 30, 2016 | June 30, 2025 | ||
| 1st | Francisco Arturo Ranches III | NPC | June 30, 2022 | June 30, 2025 | ||
| 2nd | Ericson Singson | NPC | June 30, 2022 | June 30, 2025 | ||
| 2nd | Benjamin Maggay | NPC | June 30, 2019 | June 30, 2025 | ||
| 2nd | Virginia Pe Benito | NPC | June 30, 2016 | June 30, 2025 | ||
| 2nd | Leopoldo Gironella Jr. | NPC | June 30, 2022 | June 30, 2025 | ||
| 2nd | Mildred Elaydo | NPC | June 30, 2016 | June 30, 2025 | ||
| League | Board member | Party | Start of term | End of term | ||
| ABC | Constante Benzon[1] | Nonpartisan | January 12, 2024 | January 1, 2026 | ||
| PCL | Jaime Singson[2] | NPC | August 4, 2022 | June 30, 2025 | ||
| SK | Victor Singson[3] | Nonpartisan | November 25, 2023 | January 1, 2026 | ||
| Sector | Board member | Party | Start of term | End of term | ||
| IPMR | Elpidio Quines[4] [5] | Nonpartisan | September 17, 2019 | September 17, 2025 | ||