The Aitareya Brahmana (Sanskrit: ऐतरेय ब्राह्मण) is the Brahmana of the Shakala shakha of the Rigveda, an ancient Indian collection of sacred hymns. This work, according to the tradition, is ascribed to Mahidasa Aitareya.
Sayana of Vijayanagara, a 14th century commentator, attributes the entire Aitareya Brahmana to a single man: Mahidasa Aitareya. In his introduction to the text, Sayana suggests that "Aitareya" is a matronymic name. Mahidasa's mother was "Itaraa" (इतरा), whose name is derived from the Sanskrit word "itara" (इतर, literally "the other" or "rejected"). She was one of the wives of a great rishi (sage). The rishi preferred sons from his other wives over Mahidasa. Once he placed all his other sons on his lap, but ignored Mahidasa. On seeing tears in the eyes of her son, Itara prayed to the earth goddess Bhūmi, her kuladevi (tutelary deity). Bhūmi then appeared and gifted Mahidasa the knowledge contained in the Aitareya Brahmana.
This story is considered as spurious by scholars such as Arthur Berriedale Keith and Max Müller. Mahidasa is mentioned in other works before Sayana, such as the Chandogya Upanishad (3.16.7) and the Aitareya Aranyaka (2.1.7, 3.8). But none of these works mention Sayana's legend. The Aitareya Aranyaka is undoubtedly a composite work, and it is possible that the Aitareya Brahmana also had multiple authors. According to AB Keith, the present redaction of the work may be ascribed to Mahidasa, but even that cannot be said conclusively.
The Asvalayana Srautasutra and Asvalayana Grhyasutra, attributed to the sage Asvalayana, are the srautasutra and grhyasutra associated with the Aitareya Brahmana. Some Sanskrit texts also mention a text called Asvalayana Brahmana. For example, Raghunandana (c. 16th century CE), in his Malamasatattva, quotes a verse from what he calls the Asvalayana Brahmana. The verse is a slight variation of an Aitareya Brahmana verse.