California's 34th senatorial district is one of 40 California State Senate districts. It is currently represented by of .
The district encompasses northern Orange County, including most of Santa Ana, Anaheim, Placentia, Fullerton, Buena Park, La Habra, and the west side of Orange, along with the unincorporated community of South Whittier in Los Angeles County.
Due to redistricting, the 34th district has been moved around different parts of the state. The current iteration resulted from the 2021 redistricting by the California Citizens Redistricting Commission.