The Constantines are an indie rock band from Guelph, Ontario, Canada.

The band was formed by Steve Lambke, Bryan Webb, Doug MacGregor, and Dallas Wehrle in 1999, following in the wake of the emotional hardcore band Shoulder. Their style has been described as "art-punk," and they have been compared to a mixture of bands like The Clash, Fugazi, Bruce Springsteen, and Nick Cave. They relocated to London, Ontario and then to Toronto, where in 2001 they released their self-titled first album, which was extremely popular on campus radio and was nominated for a Juno Award for Best Alternative Album.

In 2002 they released the EP The Modern Sinner Nervous Man.

Shine a Light followed in 2003. Will Kidman joined the band before this album.

In 2005, they embarked a cross-Canada tour with The Weakerthans, called The Rolling Tundra Revue.

Their album Tournament of Hearts is their last official release of Toronto record label Three Gut Records. It was released on September 27, 2005 in Canada, and October 11, 2005 in the United States.

In early 2006, they released a vinyl only split-album with The Unintended. The Constantines did four Neil Young covers, while The Unintended did four Gordon Lightfoot songs.

The guitarist Steve Lambke has recorded an album under the name Baby Eagle, and the keyboard player Will Kidman has recorded under the name Woolly Leaves.