California's 2nd senatorial district is one of 40 California State Senate districts. It is currently represented by of .
The district stretches along the North Coast from the Oregon border in the north to the northern San Francisco Bay Area in the south. It includes Del Norte, Humboldt, Trinity, Mendocino, Lake, Sonoma, and Marin Counties. The northern part of district is primarily rural, while the southern parts are more suburban.
Due to redistricting, the 2nd district has been moved around different parts of the state. The current iteration resulted from the 2021 redistricting by the California Citizens Redistricting Commission.