Mariano Guadalupe Vallejo (4 July 1807 – 18 January 1890) was a Californio military commander, politician, and rancher. He was born a subject of Spain, performed his military duties as an officer of the Republic of Mexico, and shaped the transition of Alta California from a territory of Mexico to the U. S. state of California. He served in the first session of the California State Senate. The city of Vallejo, California is named for him, and the nearby city of Benicia is named for his wife (née Francisca Benicia Carrillo).