Masarh or Masadh (Hindi: मसाढ़) is a village situated 10 km west of Arrah in Bhojpur district of Bihar.

It is an important historical site for Jains and Hindus, situated near Karisath railway station.

[2] However, according to some other people, its name was Padmvatipura which was later chanced by a Jain Marwar to Vimalnath, after that it was changed to Matisara and then it became Masarh.

According to localities, It was the residence of Banasura, whose daughter Ukha married to Aniruddha the grandson of Krishna and its name was Sonitpur.

[citation needed] The earliest mention of the village can be found in the accounts of Xuanzang, where he named it as mo-ho-so-lo.