François Marie Gabriel André Charles-Ferdinand Roelants du Vivier (born 5 November 1947) is a Belgian politician and a member of Ecolo and later the FDF (Francophone Democratic Federalists).

He is part of the political family Nothomb; his grandfather is Pierre Nothomb and his ancestors include Jean-Baptiste Nothomb, who helped draft the Belgian Constitution and served as Prime Minister.^[1]

Roelants du Vivier started his career in Ecolo, and was a Member of the European Parliament elected in 1984 and serving until 1989.

In 1988 he started the Europe-Régions-Environnement (ERE) movement after leaving Ecolo. In 1993, he announced that he would found a new party, a Belgian equivalent of the French Génération Écologie and the German Realos inside the German Greens.^[2] Under the electoral alliance FDF-ERE, he was elected to the Brussels Parliament in the 1989 elections. He was re-elected 1995, 1999 and 2004. From 2000 until 2009 he also served in the Parliament of the French Community and the Senate as community senator.^[3]

From 1994 until 2000 he was also municipal councillor in Uccle.