Formed in 1986 in Strängnäs, Merciless was one of the first Swedish death metal bands. In the mid to late 1990's the band had a longer period of inactivity, but they reformed again in 1999.

Current line-up:
Erik Wallin - Guitar (1986-1994, 1999- )
Stefan Carlsson - Drums (1986-1992, 2004- )
Roger Pettersson - Vocals (1987-1994, 1999- )
Peter Stjärnvind - Drums (1992-1994, 1999-2004), Guitar (2004- )