The governor of California is the head of government of the U.S. state of California. The governor is the commander-in-chief of the California National Guard and the California State Guard.

The Constitution of California is the primary organizing law for the U.S. state of California, describing the duties, powers, structures and functions of the government of California. California's constitution was drafted in both English and Spanish by American pioneers, European settlers, and Californios and adopted at the 1849 Constitutional Convention of Monterey, following the American Conquest of California and the Mexican–American War and in advance of California's Admission to the Union in 1850. The constitution was amended and ratified on 7 May 1879, following the Sacramento Convention of 1878–79.