Gervas John Mwasikwabhila Nyaisonga is a Tanzanian prelate of the Catholic Church. He has been Archbishop of Roman Catholic Archdiocese of Mbeya since 2018. He was consecrated bishop on 2011. He previously served as Bishop of the diocese of Dodoma from 2011 until 2014. He then served as Bishop of the diocese of Mpanda from 2014 until 2018. He was President of Tanzania Episcopal Conference from 2018 to 2024. He was appointed bishop on 9 January 2011 by Pope Benedict XVI