Banmankhi Bazar is a town and a notified area in Purnia district in the state of Bihar, India.

Banmankhi Bazar is well known for a sugar manufacturing facility, but it is currently not functioning and is closed.

Public: Sumrit High school: 6-10+2(co-ed) MatuRam Kanya Uccha Vidyalaya: 6-10 (female), G. L. M. College: Higher Education (co-ed), J.C. Science College Banmankhi is connected with Purnia, Madhepura, Saharsa and Dhamdaha (Subdivision of Purnia District) through highway.

It lies between Barauni-Katihar, Saharsa and Purnia sections of East Central Railway.

This station is connected to Purnia, Katihar, Saharsa, Patna, Kolkata, Darbhanga, Delhi, Amritsar and Ranchi.