The California State Senate is the upper house of the California State Legislature, the lower house being the California State Assembly. The state senate convenes, along with the state assembly, at the California State Capitol in Sacramento.

The California State Legislature is a bicameral state legislature consisting of a lower house, the California State Assembly, with 80 members; and an upper house, the California State Senate, with 40 members. Both houses of the Legislature convene at the California State Capitol in Sacramento. The California state legislature is one of just ten full-time state legislatures in the United States. The houses are distinguished by the colors of the carpet and trim of each house. The Senate is distinguished by the color red and the Assembly by the color green, inspired by the United Kingdom's House of Lords and House of Commons respectively.