Buxar is a nagar parishad city in the state of Bihar, India, sharing border with Balia and Ghazipur district of Uttar Pradesh. It is the headquarters of the eponymous Buxar district, as well as the headquarters of the community development block of Buxar, which also contains the census town of Sarimpur along with 132 rural villages.
The historic Battle of Chausa and Battle of Buxar were fought in this vicinity. Buxar Railway Station lies on Patna–Mughalsarai section of Howrah–Delhi main line in the zone of eastern central Indian railway. It is approximately 125 km from the state capital of Patna. Bhojpuri is the widely spoken language in Buxar.