Wilhelmus Demarteau, M.S.F. (January 24, 1917-December 5, 2012) was a Dutch prelate of the Roman Catholic Church. He was one of the oldest Roman Catholic bishops and Dutch bishops.
Demarteau was born in Horn, Netherlands and ordained a priest July 27, 1941 for the Congregation of Missionaries of the Holy Family. Demarteau was appointed Vicar Apostolic of the Diocese of Banjarmasin on January 6, 1954 along with Titular Bishop of Arsinoë in Cypro and was consecrated bishop May 5, 1954. He was appointed bishop of the Diocese of Banjarmasin and served until his resignation on June 6, 1983. Demarteau was died at December 5, 2012 in Suaka Insan Hospital (Rumah Sakit Suaka Insan:Indonesian)
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