(Hindi: सिद्धार्थनगर , Urdu: سدھارتھ نگر ) is one of the 75 districts of Uttar Pradesh state in Northern India. Naugarh town is the district headquarters. Naugarh is also a Railway Station on Gorakhpur-Anandnagar-Gonda broad-gauge line. Siddharth Nagar district is a part of Basti division. The district is known for the ruins of the Shakya Janapada, at Piprahwa which is 22 km away from the district headquarters Naugarh.