Dinosaur Jr. is an American rock band formed in Amherst, Massachusetts in 1984, originally simply called Dinosaur until legal issues forced a change in name. The band was founded by J. Mascis (guitar, vocals, primary songwriter), Lou Barlow (bass, vocals), and Murph (drums).

Members:  J. Mascis, Lou Barlow, Murph.

Past members: Mike Johnson, George Berz.

Genres: Alternative rock, indie rock, noise rock.