Fiona Ma is an American accountant and politician. She has been serving as the California state treasurer since January 7, 2019. She previously served as a member of the California Board of Equalization (2015–2019), the California State Assembly (2006–2012), and the San Francisco Board of Supervisors (2002–2006).

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.