Memory, Sorrow, and Thorn
- Book 1 - The Dragonbone Chair (Hardcover 1988, Paperback 1989)
- Book 2 - Stone of Farewell (Hardcover 1990, Paperback 1991)
- Book 3 - To Green Angel Tower (Hardcover 1993)
- Book 3 was split into 2 parts for paperback publication (1994):
- To Green Angel Tower, Part 1 and To Green Angel Tower, Part 2 (US Edition)
- To Green Angel Tower: Siege and To Green Angel Tower: Storm (UK edition)
- Novelette - The Burning Man (Legends) 1998
Graphic Novel- The Burning man
Otherland
- Book 1 - City of Golden Shadow (Hardcover 1996, Paperback 1998)
- Book 2 - River of Blue Fire (Hardcover 1998, Paperback 1999)
- Book 3 - Mountain of Black Glass (Hardcover 1999, Paperback 2000)
- Book 4 - Sea of Silver Light (Hardcover 2001, Paperback 2002)
- Novelette - The Happiest Dead Boy in the World (Legends II 2004)
Shadowmarch
- Book 1 - Shadowmarch (Hardcover 2004, Trade Paperback 2005, Mass-Market Paperback 2006)
- Book 2 - Shadowplay (Hardcover, 2007, Trade Paperback 2008, Mass-Market Paperback 2009)
- Book 3 - Shadowrise (Hardcover, 2010, Trade Paperback 2010).
- Book 4 - Shadowheart (Hardcover, forthcoming in November, 2010).
Similar to the Otherland series that was initially intended to be a trilogy but became a 'quadrilogy' instead, Book 3 became so lengthy that it was not possible to be published in one volume.
Ordinary Farm series
Young-adult, written with Deborah Beale (his wife)
- Book 1 - The Dragons of Ordinary Farm (Hardcover, June 2009)
- Book 2 - A Witch at Ordinary Farm (currently in progress, to be published in 2010)
- Book 3 - (forthcoming)
- Book 4 - (forthcoming)
- Book 5 - (forthcoming)
The Bobby Dollar Books
Noir fantasy thrillers
- Book 1 - Sleeping Late on Judgement Day (forthcoming)
- Book 2 - Happy Hour in Hell (forthcoming)
- Book 3 - Angels Rush In (forthcoming)
Standalone Novels
- Tailchaser's Song (Hardcover 1985, Paperback 1986)
- Child of an Ancient City (Paperback 1992, written with Nina Kiriki Hoffman)
- Caliban's Hour (Hardcover 1994)
- The War of the Flowers (Hardcover 2003, Paperback 2004)
Collections
- Short Work (Hardcover, 2006) Subterranean Press. Published in January 2007.
- Short Work (Trade Paperback, May 2008) Subterranean Press/Far Territories. Reprint of the limited hc edition without the non-fiction pieces. The reprint only contains the short stories.
Comic Books
- Tad Williams' Mirrorworld 2 issues. Series was cancelled after two issues because the publisher went out of business.
- The Next 6 issue mini-series published by DC Comics. Published between July and December 2006.
- Sword of Atlantis published by DC Comics. Williams replaced writer Kurt Busiek with issue #50 in March 2007. His run lasted till issue #57 when the comic was cancelled.
- The Helmet of Fate; Ibis the Invincible, 2007 one-shot for DC.