Koṭirudra-Saṃhitā, a major section of the Śiva Purāṇa—itself a classical medieval Puranic corpus—celebrates Śiva as Rudra in his multitudinous forms. Compiled and redacted over centuries, this Saṃhitā weaves myths, cosmology, hymns and ritual manuals (notably Rudrābhiṣeka and Rudra-mantras), narrating the origin and exploits of the "countless" Rudras. Its themes—divine multiplicity and unity, destruction as creative renewal, ascetic power, bhakti and dharma—shape Shaiva theology, temple iconography and liturgy. Today Koṭirudra-Saṃhitā remains a vital source for ritual practice, spiritual poetry and scholarly study, offering timeless guidance on devotion, inner transformation and the cultural heritage of classical Sanskrit religiosity.