It is both an administrative and a judicial arrondissement.

However, the Judicial Arrondissement of Tournai also comprises the municipality of Lessines in the Arrondissement of Soignies and all municipalities of the Arrondissement of Ath, with the exception of the municipalities of Brugelette and Chièvres.

In 2019 it was merged into the new Arrondissement of Tournai-Mouscron.

[1] The Administrative Arrondissement of Tournai consists of the following municipalities:

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