Rosera is a town (subdivision) at the bank of River Budhi Gandak. It is a municipality in Samastipur district in the Indian state of Bihar.
Rosera is a trading centre due to its location, situated on the trade route of the river Budhi Gandak. Rosera is an active business hub for lychee, jewellery, carpets, clothing, medicine and agriculture. As the birthplace of Krishna Karak (founder of bachchan vansi acharya gadi of Kabir Panth), Rosera became a place of pilgrimage for Kabirpanthis.
Rosera with multiple rivers flowing through, is rich in agriculture because of its fertile plain. Tobacco, maize, rice and wheat are the main crops. Leechi and mango fruits are grown in abundance. Sugarcanes are also produced here and sent to Hasanpur chini mill for processing.
Rosera celebrates many festivals during the year. One of the main festivals celebrated there is Chhath, five days after Deepawali. Makar Sankranti (Kichdi) is celebrated on 14 January, Saraswati Puja (with grand statues), Holi (all colourful), Ram Navami, Raksha Bandhan (between brothers and sisters), Durga Puja, Diwali and Chhath.
Mahaveer Mandir (at Mahaveer Chowk) and Thana Mandir (at the police station) are very famous temples of Lord Hanumaan and Goddess Durga. Rosera is a multi-cultural society which also celebrates Eid and Muharram.