A washing machine appliance and a regulator assembly therefor are generally provided. The regulator assembly may include inductive regulator may be positioned along a fluid supply conduit downstream from a water supply. The inductive regulator may include a regulator body, a rotor, a magnetic element, and an electrical stator. The regulator body may define an enclosed cavity extending between a regulator inlet and a regulator outlet. The rotor may be rotatably disposed within the regulator body. The magnetic element may be rotationally attached to the rotor. The electrical stator may be disposed outside of the enclosed cavity in selective magnetic communication with the magnetic element.