The Olivas Adobe in Ventura, California is an adobe structure built in 1837 by Raymundo Olivas on the north bank of the Santa Clara River about a mile from the estuary where it flows into the Santa Barbara Channel.

Olivas received, in recognition of his service at the Presidio of Santa Barbara, approximately 2,250 acres (9 km2) as part of land grant from Governor Juan Bautista Alvarado in 1841, which he named Rancho San Miguel.

Olivas built the adobe home in 1837, and expanded it in 1849 to two stories, making it the only such building in the area.

It later became Max Fleischmann's hunting lodge (of yeast and margarine fame).

After his death, his foundation donated the land and the house to the City of Ventura.