The Maurya Empire was a geographically extensive Iron Age historical power in ancient India, ruled by the Mauryan dynasty from 321 to 185 BC. Originating from the kingdom of Magadha in the Indo-Gangetic plains (modern Bihar, eastern Uttar Pradesh and Bengal) in the eastern side of the Indian subcontinent, the empire had its capital city at Pataliputra (modern Patna). The Empire was founded in 322 BC by Chandragupta Maurya, who had overthrown the Nanda Dynasty and rapidly expanded his power westwards across central and western India taking advantage of the disruptions of local powers in the wake of the withdrawal westward by Alexander the Great's Greek and Persian armies. By 320 BC the empire had fully occupied Northwestern India, defeating and conquering the satraps left by Alexander.

With an area of 5,000,000 km², it was one of the world's largest empires in its time, and the largest ever in the Indian subcontinent. At its greatest extent, the empire stretched to the north along the natural boundaries of the Himalayas, and to the east stretching into what is now Assam. To the west, it conquered beyond modern Pakistan, annexing Balochistan, south eastern parts of Iran and much of what is now Afghanistan, including the modern Herat and Kandahar provinces. The Empire was expanded into India's central and southern regions by the emperors Chandragupta and Bindusara, but it excluded a small portion of unexplored tribal and forested regions near Kalinga (modern Orissa), till it was conquered by Ashoka. Its decline began 60 years after Ashoka's rule ended, and it dissolved in 185 BC with the foundation of the Sunga Dynasty in Magadha.

Chandragupta Maurya (Sanskrit: चन्द्रगुप्त मौर्य महान Hindi: चन्द्रगुप्त मौर्य महान), (born c. 340 BCE, ruled c. 320 BCE, – 298 BCE) was the founder of the Maurya Empire. He succeeded in conquering most of the Indian subcontinent and is considered the first unifier of India as well as its first genuine emperor. In foreign Greek and Latin accounts, Chandragupta is known as Sandrokyptos (Σανδρόκυπτος), Sandrokottos (Σανδρόκοττος) or Androcottus.

Prior to Chandragupta's consolidation of power, small regional kingdoms dominated the northwestern subcontinent, while the Nanda Dynasty dominated the middle and lower basin of the Ganges. After Chandragupta's conquests, the Maurya Empire extended from Bengal and Assam in the east, to Afghanistan and Balochistan,some part of the easten and south-east Iran in the west, to Kashmir and Nepal in the north, and to the Deccan Plateau in the south. Tradition holds that Chandragupta abdicated his throne to become a monk and led such an ascetic life that he starved himself to death. Whether or not this is factually accurate, he was succeeded by his son in 298 BC.