Guster is an American alternative rock band from Boston, Massachusetts. Founding members Adam Gardner, Ryan Miller, and Brian Rosenworcel began practice sessions while attending Tufts University in Medford, Massachusetts, and formed the band in 1991.

The members met during the freshmen Wilderness Orientation program in August of that year, playing publicly together as a trio two months later at the Midnight Cafe coffee house set in the common area of the Lewis Hall dormitory.