Guster is an alternative rock band, which formed at Tufts University in Medford, Massachusetts, United States in 1992.

The band consists of Adam Gardner and Ryan Miller on guitar and vocals and Brian Rosenworcel on percussion. Multi-instrumentalist and backup vocalist Joe Pisapia played with the band from 2003-2010. Luke Reynolds took Pisapia’s place to tour with the band for their 2010 album, Easy Wonderful, and has remained with the band since.