Agustín Olvera (1820–1876) was a Californio-American, judge, ranchero, and politician in 19th century Los Angeles.

Olvera helped to bridge the gap between the governance of California by Mexico and the United States.

Olvera later served as captain in Flores' campaign against Frémont and was one of the commission of three that negotiated peace with the American forces at Cahuenga.

He relied upon a bilingual Sheriff to translate the proceedings from Spanish because he did not speak English when he first took the bench.

[3] In 1959, the actor Cesar Romero played Olvera in an episode of the same name on the syndicated television anthology series, Death Valley Days, hosted by Stanley Andrews.