Sudha Varghese, also known as Sister Sudha, is a social worker and Catholic nun in India who has devoted herself to the Musahar, the Dalit of Bihar and Uttar Pradesh, one of the Scheduled Castes and who are considered the "untouchables". She resides and works in Jamsaut, a village in Patna district. She is sometimes called didi, which means elder sister. Varghese has stated that she draws inspiration from B. R. Ambedkar, a Dalit who fought against the concept of untouchability and was one of the drafters of the Constitution of India.