Haṭharatnāvalī (Hatharatnavali) is a compact medieval Sanskrit manual from the Hatha‑yoga lineage that distills older teachings into a practical handbook. Concise and practice‑oriented, it treats asana, prāṇāyāma, śatkarmas (purifications), bandhas and mudrās, and techniques for awakening kuṇḍalinī and inner heat. Written as a synthesis of classical Hatha authorities, its crisp aphoristic style made complex subtle‑body methods accessible to practitioners. Key themes are disciplined breath‑body coordination, energetic hygiene, and the use of seals and locks to direct subtle energy toward spiritual transformation. Today Haṭharatnāvalī remains relevant as a historical source for traditional Hatha practice, informing modern yoga, scholarly study, and those seeking authentic techniques for embodied meditation and inner regulation.