| Laoag Cathedral | |
|---|---|
| Saint William's Cathedral | |
Catedral de San Guillermo (Spanish) | |
 Cathedral facade in 2022 | |
.svg)  Laoag Cathedral .svg) Laoag Cathedral | |
| 18°11′38″N 120°35′37″E / 18.193811°N 120.593532°E | |
| Location | Laoag, Ilocos Norte |
| Country | Philippines |
| Denomination | Roman Catholic |
| History | |
| Status | Cathedral |
| Founded | 1580 |
| Dedication | Saint William of Maleval |
| Architecture | |
| Functional status | Active |
| Architectural type | Church building |
| Style | Italian Renaissance |
| Completed | 1880 (current) |
| Specifications | |
| Number of towers | 1 |
| Administration | |
| Province | Nueva Segovia |
| Diocese | Laoag |
| Clergy | |
| Bishop(s) | Renato Mayugba |
Saint William's Cathedral, commonly known as Laoag Cathedral, is a Roman Catholic church in Laoag City, Ilocos Norte, Philippines. It serves as the seat or central church of the Diocese of Laoag. The current church was built in 1612 by Augustinian friars to replace a wooden chapel.