Kathauna Bazar is a city in Shambhunath Municipality Ward No. 6, in the Saptari district of Nepal. It is 20 km east of Lahan Municipality, and is the central city of Shambhunath Municipality. Shambhunath municipality's head office is located at Kathauna Bazar. At the time of the 1991 Nepal census it had a population of 5167 people, living in 933 individual households.
Health center
Buses of all classes (deluxe, air-conditioned, and regular) ply daily between Kathauna and major cities such as Biratnagar, Kathmandu, Pokhara, Birgunj and Kakarbhitta through Mahendra Highway.
Kathauna is reached by Rajbiraj Airport since, a regular scheduled flight has been organized from Rajbiraj, the flight was halted since 2007. See Rajbiraj Airport.