Ujjain (/uːˈdʒeɪn/;  listen ) is the largest city in Ujjain district of the Indian state of Madhya Pradesh. It is the administrative center of Ujjain district and Ujjain division.

An ancient city situated on the eastern bank of the Kshipra River, Ujjain was the most prominent city on the Malwa plateau of central India for much of its history. It emerged as the political centre of central India around 600 BCE. It was the capital of the ancient Avanti kingdom, one of the sixteen mahajanapadas. It remained an important political, commercial and cultural centre of central India until early 19th century, when the British administrators decided to develop Indore as an alternative to it. Ujjain continues to be an important place of pilgrimage for Shaivites, Vaishnavites and followers of Shakta.