Eidos-Montréal is a Canadian video game development studio owned by Square Enix Europe, a subsidiary of Square Enix. The studio was founded by Eidos Interactive in 2007 with Stéphane D'Astous appointed general manager.  According to D'Astous, unlike other video game development studios, Eidos Montréal's development cycle is characterized by smaller teams (totalling 350) working over a longer period.  The same year as its founding, the studio announced its first project: the third installment of the Deus Ex series, Deus Ex: Human Revolution, which was released in 2011.  In 2009, the studio announced its second project, the fourth installment of the Thief series.  On 4 March 2014, Square Enix announced that 27 employees were laid off from Eidos Montréal.  Stéphane D'Astous resigned from Eidos Montréal on 19 July 2013, citing irreconcilable differences with parent company Square Enix.

On January 26, 2017, Eidos Montréal announced a partnership with Marvel Entertainment to create multiple video games based on the Avengers franchise.