Saharsa is a city and municipal corporation in the Saharsa District in the eastern part of the state of Bihar, India. It is situated near the eastern banks of the Kosi River. It serves as the administrative headquarters for the Saharsa District and is also the Divisional headquarters of the Kosi Division.

Saharsa is one of the thirty-eight districts of Bihar, India. Saharsa city is the administrative headquarters of this district. Saharsa district is a part of the Kosi Division and it became a district on 1 April 1954 and has subsequently become smaller with other districts being carved from it, most notably Madhepura in 1981.