Personil Dream Theater

Personel Sekarang

1.James LaBrie - Vocals and percussion (1991 - present)
2.John Petrucci - Guitars and backing vocals (1985 - present)
3.Mike Portnoy - Drums, percussion and backing vocals (1985 - present)
4.John Myung - Bass and Chapman Stick (1985 - present)
5.Jordan Rudess - keyboards, lap steel guitar, and Continuum (1999 - present)

Mantan personel
1.Chris Collins - Vocals (1986)
2.Charlie Dominici - Vocals (1987- 1990)
3.Kevin Moore - Keyboards (1986-1994)
4.Derek Sherinian - Keyboards (1995-1999)
5.Wiki Dermawan