The Diocese of Mananjary is a Roman Catholic Latin Rite diocese under the Archdiocese of Fianarantsoa in Madagascar. It is based in the town of Mananjary and was erected on 9 April 1968. The Diocese covers approximately 14,270 km. As of 2004, the diocese population was about 700,000 with 14.8% Catholic. 35 priests were in the Diocese for a ratio of 2,962 Catholics for every 1 Priest. José Alfredo Caires de Nobrega, SCI has been the bishop of the Diocese since October 2000.