Arizona's 23rd legislative district is one of 30 in the state, consisting of sections of Maricopa County, Pima County, Pinal County, and Yuma County. As of 2023, there are 65 precincts in the district, with a total registered voter population of 121,771. The district has an overall population of 232,246.

Brian Fernandez is an American politician who is State Senator for the Arizona 23rd Legislative District and former member of the Arizona House of Representatives from the 4th legislative district beginning in 2021. He was appointed to the seat after incumbent Representative Charlene Fernandez, his mother, resigned the seat to become Director of Rural Development for the United States Department of Agriculture. He is a member of the Democratic Party.