A novel and improved automobile spare tire anti-theft device and method is disclosed. In an embodiment, the spare tire anti-theft device can include a rigid arm member having a proximal end, an arm body, and a distal end. The proximal end can be configured to be removably secured to an automobile. The arm body is configured such that at least a portion of the arm body is positioned adjacent an exposed portion of a sidewall of a tire of a spare tire secured to the automobile when the proximal end is secured to the automobile.