Yorba Hacienda, Former adobe hacienda site in Yorba Linda, California, US

Yorba Hacienda was an adobe building in Yorba Linda, California, arranged in a U-shape with a southern wall over 100 feet (30 meters) long. The structure held more than 200 rooms, making it one of the largest private residences of the Mexican period in the region.

Bernardo Yorba received 13,328 acres on the north side of the Santa Ana River from Governor José Figueroa on August 1, 1834, and began building in 1835, completing the adobe in stages over several years. After his death in 1858 the hacienda declined as the land was divided among heirs. Owner Samuel Kraemer demolished it in 1926 to stop vandalism and plowed the site into a barley field.

The hacienda's name, Hacienda de San Antonio, honoured San Antonio, patron saint of the Yorba household; the adobe chapel Iglesia de San Antonio, built about 1858, was dedicated to him on 29 April 1860. About 100 Gabrieleño Indians worked on the rancho and lived in a nearby village, and the household kept a jail with a cellar called the 'dungeon' between the residence and the schoolrooms.

A stone marker with a bronze plaque now stands at the original site and gives basic information about the building. The spot is easy to combine with a visit to other heritage sites in the Yorba Linda area.

The pine beams used in construction were hauled by ox cart from the San Bernardino Mountains, a long journey over rough terrain. This effort shows how much planning went into building on such a remote site with no nearby supply of timber.