Éric Castonguay (born September 18, 1987) is a Canadian ice hockey coach and former professional player.

Castonguay's Midget AAA [fr] career included time with Collège Antoine-Girouard, followed by 3 seasons with the Lewiston Maineiacs of the Quebec Major Junior Hockey League for his Major Junior Ice Hockey career.

[1] On June 2, 2011, the Reading Royals of the ECHL announced that they had included Castonguay on their protected list.

[1] On September 21, 2013, Castonguay signed with the Missouri Mavericks of the Central Hockey League for the 2013–14 season.

[8] After having a productive season where he ranked third in the league for scoring, Castonguay signed an extension with the team.