Personil Dream Theater ( Sekarang Dan Mantan )

Personil sekarang :

James Labrie - Vocals and percussion (1991 - present)
 

James Labrie

	Nama : Kevin James LaBrie Lahir : 5 Mei 1963 (umur 49) Penetanguishene, Ontario, Canada Label : Roadrunner
	Situs resmi : jameslabrie.com

 John Petrucci - Guitars and backing vocals 
(1985 - present)

John Petrucci

Nama : John Peter Petrucci
Genre : Progressive metal, instrumental rock, progressive rock, jazz fusion 
Instrumen :  Gitar, Vokal, Drum
Tahun aktif : 1985 - sekarang
Label : Roadrunner/Sound Mind Music
Artis terkait : Dream Theater, Liquid Tension Experiment, Explorers Club, Jon Finn Group, Nightmare Cinema
 
 Situs resmi : www.johnpetrucci.com


Mike Portnoy - Drums, percussion and backing vocals (1985 - present)

Mike Portnoy

  Nama : Michael Stephen Portnoy
  Tahun aktif : 1985 - sekarang
  Tanggal Lahir : April 20, 1967
  Situs Resmi : www.mikeportnoy.com 






John Myung - Bass and Chapman Stick 
(1985 -present)

John Myung

Nama : John Ro Myung
Lahir : 24 Januari 1967 (umur 45)
Asal : Chicago, Illinois, U.S.
Genre : Progressive metal, progressive rock, jazz fusion
Pekerjaan : Musician
Instrumen : Bass, Chapman Stick, Guitar, Keyboard, Violin
Tahun aktif : 1985–present
Artis terkait : Dream Theater, Platypus, The Jelly Jam, Explorers Club, Gordian Knot, Nightmare Cinema, Nicky Lemmons and the Migrane Brothers


Jordan Rudess - keyboards,lap steel guitar, and Continuum (1999 - present)

Jordan Rudess

Nama : Jordan Rudess
Lahir : 4 November 1956 (umur 55)
Asal : USA
Genre : Progressive metal
Progressive rock
Instrumental , Jazz fusion , New Age , Instrumen 
Keyboards , Continuum
Lap steel guitar
Tahun aktif : 1981 - sekarang
Artis terkait : Dream Theater , Tension Experiment



Mantan Personoil Lama :

• Chris Collins - Vocals (1986)
• Charlie Dominici - Vocals (1987- 1990)
• Kevin Moore - Keyboards (1986-1994)
• Derek Sherinian - Keyboards (1995-1999)