Castonguay

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