Robert-Joseph Mathen (1916–1997) was the 28th Bishop of Namur in Belgium.

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Mathen was born in Aubange on 30 December 1916,^[1] and was educated at Collège Saint-Joseph de Virton.^[2] He entered the seminary and was ordained to the priesthood on 25 August 1940,^[2] after which he studied Theology at the Catholic University of Leuven.^[1] In 1960 he was appointed dean of Arlon, and on 24 June 1974 he became bishop of Namur.^[1] He had already been consecrated as his predecessor's coadjutor bishop on 3 May the same year.^[2] In 1990 Pope John-Paul II accepted his resignation, to come into force when his successor was appointed.^[2]

He died as a result of pneumonia on 19 January 1997 and his funeral service took place in Namur cathedral on 23 January.^[1]