Abstract: A windmill rotation restrictor device restricts the speed of rotation of front blades of a decorative windmill in high winds. The device includes a windmill having a base, a rotor, and a vane. The rotor includes a front blade assembly and a front shaft extending from the front blade assembly. The front shaft is freely rotatable relative to the base. The vane includes a rear blade assembly and a rear shaft extending from the rear blade assembly. The rear shaft is freely rotatable relative to the base. The front blade assembly and the rear blade assembly rotate in opposite directions when blown by wind from a single direction. A linkage couples the front shaft to the rear shaft such that rotation of the rear blade assembly counteracts and slows rotation of the front blade assembly.