Abstract: A motion sensing switch actuator assembly is provided for automatically switching an existing light switch upon detection of motion. The assembly includes a housing having a rear face. An actuator is slidably coupled to the rear face of the housing. The actuator is configured for engaging and flipping a switch positioned adjacent to the rear face of the housing when the actuator slides relative to the housing. A motion sensor is coupled to the housing and configured for detecting motion proximate the housing. A processor is operationally coupled to the motion sensor and the actuator to selectively slide the actuator upon detection of predetermined input from the motion sensor.