Hanuman Tantra Siddhi is a Hindi spiritual guide authored by C. M. Srivastava and published by Manoj Publications (2009, 184 pages). The book explores devotional tantra and mantra practices centered on Lord Hanuman, blending traditional worship with ritual techniques aimed at attaining spiritual siddhis (powers). It includes descriptions of anushthan (rituals), practical guidance, and concise explanations of tantric applications for devotees and sadhaks. Intended for serious practitioners, the text offers a blend of spiritual devotion and esoteric methods to invoke Hanuman’s energy for strength, protection, and overcoming obstacles. This work is valued as a collection piece for Hanuman devotees and tantra‑mantra enthusiasts wishing to deepen their practice or understanding of sacred techniques.