Non-dualism is a branch of Vedanta philosophy that was propagated primarily by the great Adi-Sankara, who synthesised the essence of many preceding scholars and systematised it as the Advaita-vedanta system. 

​The influence of Advaita-vedanta on the field of Yoga gained significant prominence and has lasted till the current day. Today there are numerous practitioners who identify themselves as belonging to the Advaita school of Yoga. 

But is Yoga indeed non-dual?