The Brahmanas (/ˈbrɑːmənəz/; Sanskrit: ब्राह्मणम्, IAST: Brāhmaṇam) are Vedic śruti works attached to the Samhitas (hymns and mantras) of the Rig, Sama, Yajur, and Atharva Vedas. They are a secondary layer or classification of Sanskrit texts embedded within each Veda, which explain and instruct on the performance of Vedic rituals (in which the related Samhitas are recited). In addition to explaining the symbolism and meaning of the Samhitas, Brahmana literature also expounds scientific knowledge of the Vedic Period, including observational astronomy and, particularly in relation to altar construction, geometry. Divergent in nature, some Brahmanas also contain mystical and philosophical material that constitutes Aranyakas and Upanishads.

Each Veda has one or more of its own Brahmanas, and each Brahmana is generally associated with a particular Shakha or Vedic school. Less than twenty Brahmanas are currently extant, as most have been lost or destroyed. Dating of the final codification of the Brahmanas and associated Vedic texts is controversial, as they were likely recorded after several centuries of oral transmission. The oldest Brahmana is dated to about 900 BCE, while the most recent are dated to around 700 BCE.

Brahmana (or Brāhmaṇam, Sanskrit: ब्राह्मणम्) can be loosely translated as 'explanations of sacred knowledge or doctrine' or 'Brahmanical explanation'. According to the Monier-Williams Sanskrit dictionary, 'Brahmana' means:

M. Haug states that etymologically, 'the word ['Brahmana' or 'Brahmanam'] is derived from brahman which properly signifies the Brahma priest who must know all Vedas, and understand the whole course and meaning of the sacrifice... the dictum of such a Brahma priest who passed as a great authority, was called a Brahmanam'.

S. Shrava states that synonyms of the word 'Brahmana' include:

R. Dalal states that the 'Brahmanas are texts attached to the Samhitas [hymns] – Rig, Sama, Yajur and Atharva Vedas – and provide explanations of these and guidance for the priests in sacrificial rituals'. S. Shri elaborates, stating 'Brahmanas explain the hymns of the Samhitas and are in both prose and verse form... The Brahmanas are divided into Vidhi and Arthavada. Vidhi are commands in the performance of Vedic sacrifices, and Arthavada praises the rituals, the glory of the Devas and so on. The belief in reincarnation and transmigration of soul started with [the] Brahmanas... [The] Brahmana period ends around 500 BC[E] with the emergence of Buddhism and it overlaps the period of Aranyakas, Sutras, Smritis and the first Upanishads'.

M. Haug states that the 'Veda, or scripture of the Brahmans, consists, according to the opinion of the most eminent divines of Hindustan, of two principal parts, viz. Mantra [Samhita] and Brahmanam... Each of the four Vedas (Rik, Yajus, Saman, and Atharvan) has a Mantra, as well as a Brahmana portion. The difference between both may be briefly stated as follows: That part which contains the sacred prayers, the invocations of the different deities, the sacred verses for chanting at the sacrifices, the sacrificial formulas [is] called Mantra... The Brahmanam [part] always presupposes the Mantra; for without the latter it would have no meaning... [they contain] speculations on the meaning of the mantras, gives precepts for their application, relates stories of their origin... and explains the secret meaning of the latter'.

J. Eggeling states that 'While the Brâhmanas are thus our oldest sources from which a comprehensive view of the sacrificial ceremonial can be obtained, they also throw a great deal of light on the earliest metaphysical and linguistic speculations of the Hindus. Another, even more interesting feature of these works, consists in the numerous legends scattered through them. From the archaic style in which these mythological tales are generally composed, as well as from the fact that not a few of them are found in Brâhmanas of different schools and Vedas, though often with considerable variations, it is pretty evident that the ground-work of many of them goes back to times preceding the composition of the Brâhmanas'.