Bhairav Tantra Siddhi is a spiritual and religious guide focused on the ancient practices, rituals, and mantras of Bhairav Tantra as part of Indian Tantric traditions. Authored by C. M. Srivastava and published by Manoj Publications, the book is written in Hindi and spans about 180–184 pages of Tantra theory and practice. It explores Bhairav Puja, Upasana, mantra sadhana, and traditional tantric methods aimed at spiritual elevation and Siddhi (realization or attainment). The text combines scriptural insights with ritual instructions, making it useful for sincere seekers and practitioners of Shaivite and Tantric worship. As part of the wider Hindu spirituality genre, the book serves both as a reference for devotional worship and as a practical handbook for tantric rites.