Castonguay Explained

Castonguay is a surname. Notable people with this surname include:

• Alexandre Castonguay (born 1968), Canadian media artist
• Antoine Castonguay (1881–1959), Canadian politician
• Charles Castonguay (born 1940), Canadian mathematician
• Claude Castonguay (1929–2020), Canadian politician
• Émilie Castonguay, Canadian sports agent
• Éric Castonguay (born 1987), Canadian ice hockey player
• Jeannot Castonguay (born 1944), Canadian politician
• Marilyn Castonguay, Canadian actress
• Mike Castonguay, American musician
• Roch Castonguay, Canadian film and television actor