Sultanganj is a city and a notified area in Bhagalpur
district in the Indian state of Bihar
. It is situated on the south bank of Ganga river, 25 km west of Bhagalpur city.Sultanganj is a place of great antiquity. It has been traditionally associated with Jahnu sage, whose ashram was a center of learning and culture. Muni Ashram Jahnu in the rock protruding into the bed of the Ganges. Now the site has Ajgaivinath Shiva temple, also known as Gaibinath Mahadeo.
An excellent all-weather road connects Bhagalpur with Monghyr and Patna
. Sultanganj has a railway station of the same name on the loop-line of the Eastern Railway running from Kolkata to Kiul. A new railway line is being constructed from Sultanganj to Deoghar.