Castonguay, société d'avocats is a law firm founded by Guillaume Castonguay in 2019 in Témiscouata-sur-le-Lac, Quebec, that has since opened offices in Rivière-du-Loup and Rimouski. The firm's lawyers practise in family law, civil and municipal law, criminal and penal law, administrative law, youth law, and family mediation, serving the Bas-Saint-Laurent region and the judicial district of Rimouski.

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A person using a wheelchairAccessible parkingA laptop showing a video callVirtual appointmentsA calendar with a checkmark beside a clockBy appointment

This firm’s lawyers at a glance

Languages on the roster
French

Offices 4

421 Rue Denison O, Granby, QC J2G 8B6

22 Rue de l'Évêché E, Rimouski, QC G5L 8Y3

12 Rue de la Cour, Rivière-du-Loup, QC G5R 1J2

837 R. Commerciale N, Témiscouata-sur-le-Lac, QC G0L 1E0

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This listing was generated by AI from public sources in August 2026. It may contain errors, and we can’t guarantee it’s accurate or complete. Before you rely on anything here, verify it on the firm’s own website. Verify licence status in the Barreau du Québec directory ↗

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