Mahagathbandhan (MGB), (Hindi: महागठबंधन) also known as Grand Alliance, is a coalition of political parties in the Eastern state of Bihar in India, formed ahead of the 2015 Vidhan Sabha elections in Bihar. The alliance consists of Rashtriya Janata Dal (RJD), Janata Dal (United), Indian National Congress (INC), and Left parties including Communist Party of India (CPI), Communist Party of India (Marxist–Leninist) Liberation-CPIML (Liberation) and Communist Party of India (Marxist) (CPIM), with Nitish Kumar (Chief Minister) as the leader and Tejashwi Yadav (Deputy Chief Minister) as the chairperson. It is the ruling coalition government in Bihar.