Placidus Gervasius Nkalanga, OSB (19 June 1919 – 18 December 2015) was a Tanzanian Prelate of the Roman Catholic Church.
He was a monk of the St Maurus & St Placidus Hanga Abbey in Hanga, Ruvuma Region, Tanzania, a Benedictine monastery of the Congregation of Missionary Benedictines of Saint Ottilien.
He lived there for 42 years, from his resignation from the bishopry in 1973 until his death in 2015.