William Leon Jones is an American politician from California who served in the California State Assembly and later served as California's 25th Secretary of State for two terms from 1995 to 2003 under Governors Pete Wilson and later Gray Davis. He was an unsuccessful Republican candidate for Governor of California in 2002 as well as an unsuccessful candidate for the United States Senate from California in 2004 against incumbent Democrat Barbara Boxer. As of 2024, he is the most recent Republican to be elected to California Secretary of State to date.

The secretary of state of California is the chief clerk of the U.S. state of California, overseeing a department of 500 people. The secretary of state is elected for four year terms, like the state's other constitutional officers; the officeholder is restricted by term limits to two terms. The current secretary of state is Shirley Weber, who assumed the role in 2021 after Alex Padilla's appointment to the US Senate.