The Diocese of Darjeeling is a Latin Roman Catholic suffragan diocese situated in the north east of India, in the ecclesiastical province of the Metropolitan Archdiocese of Calcutta, yet depends on the missionary Roman Congregation for the Evangelization of Peoples. It includes within its territory the independent (essentially Buddhist) Himalayan state of Bhutan, where Christianity is practiced by a tiny minority and proselytism is forbidden. The cathedral episcopal see is the Marian Immaculate Conception Cathedral, in Darjeeling, West Bengal state, India.