Mantrayog is a short treatise on Mantrayog as one of the four major aspects of Shrividyaakhandmahayog sadhana. H H Shrigurudev Shriniwasji introduces sixteen aspects of Mantrayog as a spiritual practice. Mantrayog as popular spiritual practice contains hitherto some unknown and secret aspects and they are introduced by Shrigurudev for the first time before spiritual seekers. This book is very handy for those who do spiritual sadhana through Mantrayog.