Olive City, or Olivia, was a short-lived town, steamboat landing, and ferry crossing on the Colorado River in what was then Yuma County, Arizona Territory, from 1863 to 1866.

Olivia was suspected as a staging point for Confederate sympathizers heading east to join in the Civil War.

Also on May 20, 1863, nearby La Paz was the site of the La Paz Incident where a Confederate sympathizer shot and killed two Union soldiers traveling up river to Fort Mohave on the steamer Cocopah that were there to purchase supplies.

To break up this activity a detachment of union infantry from Fort Mohave set up a camp halfway between La Paz and Olivia in September 1863.

In nearby Ehrenberg, there is a historic cemetery, including the first settlers of multiple European and other ethnicities, such as Jewish-Americans whose graves have piles of stones, a Jewish burial custom.