Prabartak Sangha (Bengali: প্রবর্ত্তক সংঘ) is a charitable institution known for its social work. It was founded in 1920 by Motilal Roy, a revolutionary, who was inspired and initiated in the spiritual path by Sri Aurobindo. Based in Chandernagore, the Prabartak Sangha in its heyday had branches in the districts of Howrah, undivided 24 Parganas and Chittagong.