Daniel Mongrain (born July 4, 1976) (also known as Dan Mongrain and Chewy) is a Canadian musician, known as a co-founder of the Quebec technical death metal band Martyr, in which he composes, sings and plays guitar. Mongrain is also currently guitarist for the Canadian thrash/progressive metal band Voivod since 2008, replacing late guitarist Denis D'Amour.
Before joining Voivod, Mongrain also joined a number of established technical death metal bands.