Global InformationSanta Gertrudis Asistencia information
 Santa Gertrudis Asistencia Monument, April 2018 | |
| Location | Approximately five miles north of Mission San Buenaventura on the Camino Real |
|---|---|
| Coordinates | 34°20′51″N 119°17′49.5″W / 34.34750°N 119.297083°W |
| Patron | Gertrude the Great |
| Native tribe(s) Spanish name(s) | Chumash |
The Santa Gertrudis Asistencia, also known as the Santa Gertrudis Chapel, was an asistencia ("sub-mission") to the Mission San Buenaventura, part of the system of Spanish missions in Las Californias—Alta California. Built at an unknown date between 1792 and 1809, it was located approximately five miles from the main mission, inland and upstream along the Ventura River. The site was buried in 1968 by the construction of California State Route 33. Prior to the freeway's construction, archaeologists excavated and studied the site. A number of foundation stones were moved and used to create the Santa Gertrudis Asistencia Monument which was designated in 1970 as Ventura County Historic Landmark No. 11.