Estado de Occidente (; also known as Sonora y Sinaloa) was a Mexican state established in 1824. The constitution was drafted in that year and the government was initially established with its capital at El Fuerte, Sinaloa. The first governor was Juan Miguel Riesgo. The state consisted of modern Sonora and Sinaloa, and also modern Arizona more or less south of the Gila River (although in much of this area the Yaqui, Pima, Apaches, and other native inhabitants in certain time did not recognize the rule of the state).