The cactus wren is a species of wren endemic to the deserts of the southwestern United States and northern and central Mexico. It is the state bird of Arizona and the largest wren in the United States. Its common name derives from their frequenting desert cactus plants such as the saguaro and cholla, building nests, roosting, and seeking protection from predators among them.

The cactus wren was designated as a state bird of Arizona on 16 March 1931 by the Arizona State Legislature in House Bill 128. The bill specifically designates the subspecies C. b. couesi as the state bird, and refers to the bird as both the "Cactus Wren" and "Coues' Cactus Wren".

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