John Chiang is an American politician who served as the 33rd Treasurer of California from 2015 to 2019. A member of the Democratic Party, he previously served as the 31st Controller of California from 2007 to 2015 and on the California State Board of Equalization from 1997 to 2007.

The state treasurer of California is a constitutional officer in the executive branch of the government of the U.S. state of California. Thirty-five individuals have held the office of state treasurer since statehood. The incumbent is Fiona Ma, a Democrat. The state treasurer's main office is located in the Jesse M. Unruh State Office Building in Sacramento.