The Alchemy Wars

• The Mechanical (2015, ISBN 978-0316248006)
• The Rising (2015, ISBN 978-0356502335)
• The Liberation (2016, ISBN 978-0316248051)

The Milkweed Triptych

• Bitter Seeds (2010, ISBN 978-0765321503)
• The Coldest War (2012, ISBN 978-0765321510)
• Necessary Evil (2013, ISBN 978-0765321527)

Serial fiction

• The Witch Who Came in from the Cold (co-created by Max Gladstone and Lindsay Smith)
  • The Witch Who Came in from the Cold Season One (with Lindsay Smith, Max Gladstone, Cassandra Rose Clarke, and Michael Swanwick)
    • Episode 5: "The Golem" (2016)
    • Episode 7: "Radio Free Trismegistus" (forthcoming, 2016)
    • Episode 11: "King's Gambit Accepted" (forthcoming, 2016)

Other novels

• Something More Than Night (2013, Tor Books, ISBN 9780765334329)

Wikiquote has quotations related to Ian Tregillis.

• REVIEW : Necessary Evil
• Story behind Milkweed Triptych — Essay
• Ian Tregillis at RT Book Reviews