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- Eurocities President and Mayor of Ghent
- Mathias Toon Cecil Willy De Clercq is a Belgian politician, member of the Flemish liberal party. He is currently the mayor of Ghent. Since June 2025, he is also President of the Eurocities network. From 2007 until 2014, he was a federal representative, and from 2014 until 2019, he was a Flemish representative. From 2007 until 2019, he was alderman in Ghent. He belongs to the social liberal wing of his party.
De Clercq was born in Ghent, son of lawyer and alderman Yannick Frans de Clercq (1954), grand officer of the Order of Leopold II. He is the grandson of Viscount Willy De Clercq, a former European Commissioner.
