The 2nd Regiment California Volunteer Cavalry was a cavalry regiment in the Union Army during the American Civil War. It spent its entire term of service in the western United States, with most of its companies dispersed to various posts.

The 2nd Regiment California Volunteer Cavalry was raised in response to President Lincoln's second call for troops in August 1861. By October 30, 1861, the regiment was organized and mustered into the service. The companies were assembled at Camp Alert in San Francisco. After completing the organization of the regiment, and a short period for drill and discipline, the regiment was sent, by companies, to various posts within the Department of the Pacific. The regiment was mustered out in March, 1866, although some companies remained in service beyond that date.

The 2nd California Cavalry has a number of company guidons preserved in the state capitol. The Regimental colors were lost; the only flags that survived were one national flag and three company flags. Most of these flag were made by locals in towns and nearby areas for "their" companies. In 1862 Quartermaster R. L. Ogden Ordered four guidons from D. Norcross for Companies B, D, G, and J. A few months later Lieutenant Livergood of Company I was presented with a national flag made by the women of Visalia.