| Post: | Governor |
| Body: | Ilocos Sur |
| Incumbent: | Jerry Singson |
| Incumbentsince: | June 30, 2022 |
| Residence: | Ilocos Sur Provincial Capitol |
| Termlength: | 3 years |
| Formation: | 1818 (Spanish era), 1901 (American era) |
| Inaugural: | Mena Crisologo |
The governor of Ilocos Sur (Filipino; Pilipino: Punong Panlalawigan ng Ilocos Sur), is the chief executive of the provincial government of Ilocos Sur.
| Governor[1] | Term | ||
|---|---|---|---|
| 1 | 1901-1906 | ||
| 2 | Felix Angco | 1906-1908 | |
| 3 | Estanislao Reyes | 1908-1909 | |
| 4 | Manuel Singson | 1910-1912 | |
| 5 | 1912-1916 | ||
| 6 | Jose Villanueva | 1916-1919 | |
| 7 | Simeon Reyes | 1919-1925 | |
| 8 | Alberto Reyes | 1925-1928 | |
| 9 | Alejandro Quirolgico | 1928-1931 | |
| 10 | Lupo Biteng | 1931-1932 | |
| (9) | Alejandro Quirolgico | 1933-1936 | |
| 11 | Pedro Singson Reyes | 1937-1941 | |
| 12 | Pascual Pimentel | 1943-1945 | |
| 13 | Sixto Brillantes | 1945-1946 | |
| 14 | Perfecto Faypon | 1946-1952 | |
| 15 | Eliseo Quirino | 1952-1955 | |
| (11) | Pedro Singson Reyes | 1956-1959 | |
| 16 | Godofredo S. Reyes | 1960-1963 | |
| 17 | Carmen "Carmeling" P. Crisologo | 1964-1971 | |
| 18 | 1972-1986 | ||
| 19 | Jose G. Burgos Jr. | 1986-1987 | |
| 20 | Antonio "Yeng" Abaya | 1987 | |
| 21 | Anita Lorenzana | 1987-1988 | |
| 22 | Evaristo "Titong" C. Singson | 1988 | |
| 23 | Mariano M. Tajon | 1989-1992 | |
| 24 | 1992 | ||
| (18) | Luis "Chavit" Singson | 1992-2001 | |
| (24) | Deogracias Victor Savellano | 2001-2004 | |
| (18) | Luis "Chavit" Singson | 2004-2007 | |
| (24) | Deogracias Victor Savellano | 2007-2010 | |
| (18) | Luis "Chavit" Singson | 2010-2013 | |
| 25 | 2013-2022 | ||
| 26 | 2022–present |