Studio Albums
- When Dream and Day Unite (1989)
- Images and Words (1992)
- Awake (1994)
- A Change of Seasons (1995) – An EP featuring a single long track and a live recording.
- Falling into Infinity (1997)
- Metropolis Pt. 2: Scenes from a Memory (1999)
- Six Degrees of Inner Turbulence (2002)
- Train of Thought (2003)
- Octavarium (2005)
- Systematic Chaos (2007)
- Black Clouds & Silver Linings (2009)
- A Dramatic Turn of Events (2011)
- Dream Theater (2013)
- The Astonishing (2016)
- Distance Over Time (2019)
- A View from the Top of the World (2021)
Live Albums
- Live at the Marquee (1993) – Live EP
- Once in a LIVEtime (1998)
- Live Scenes from New York (2001) – The first live release to include a full concert.
- Live at Budokan (2005)
- Score (2006) – A live double album with the Octavarium Orchestra.
- Live at Luna Park (2013)
- Breaking the Fourth Wall (2014) – A live album and video recorded at the Boston Opera House.
- Distance Over Time – Live (2019) – Live album and video from their tour supporting the Distance Over Time album.
Compilation Albums
- Greatest Hit (…And 21 Other Pretty Cool Songs) (2008) – A compilation of their most popular tracks.
- The Best of Times (2009) – A compilation album featuring highlights from their career.
- The Essential Dream Theater (2011) – A compilation featuring key tracks from their discography.
- The Studio Albums 1992–2011 (2012) – A box set of their studio albums from Images and Words to A Dramatic Turn of Events.
Notable EPs and Singles
- “A Change of Seasons” (1995) – EP
- “Live at the Marquee” (1993) – Live EP

