List of political parties in California

The recent and current politics of the U.S. state of California are complex and involve a number of entrenched interests. (For historical politics, see Politics of California before 1900).

The Big Five is an informal institution of the legislative leadership role in California's government, consisting of the governor, the Assembly speaker, the Assembly minority leader, the Senate president pro tempore, and the Senate minority leader. Members of the Big Five meet in private to discuss bills pending in the legislature. Because the party caucus leaders in California's legislature also control the party's legislative campaign funds, the leaders wield tremendous power over their caucus members. They are thus able to exert some influence in their caucus's votes in Big Five meetings.

Only the Democratic Party and Republican Party currently have representation in the State Legislature. However, for a brief period around the turn of the 21st century, one member of the Green Party was a member of the State Assembly, representing the eastern San Francisco Bay Area.

California currently uses the plurality voting system ("First-past-the-post") in its elections, but some municipalities such as San Francisco and Berkeley have opted to use a system of preferential voting, currently used in Australia and Ireland, more popularly known in the United States as instant-runoff voting or ranked choice voting.

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