Awadh, known in British historical texts as Avadh or Oudh, is a historical region in northern India, now constituting the northeastern portion of Uttar Pradesh. It is roughly synonymous with the ancient Kosala region of Hindu, Buddhist, and Jain scriptures.

Kosala, sometimes referred to as Uttara Kosala was one of the Mahajanapadas of ancient India. It emerged as a small state during the Late Vedic period and became one of the earliest states to transition from a lineage-based society to a monarchy. By the 6th century BCE, it had consolidated into one of the four great powers of ancient northern India, along with Magadha, Vatsa, and Avanti.