Published books – some are available in Kindle format; see the eBooks link. The links below take you to the Wikipedia pages about the book or authors.
- Birth of Fire (1976)
- Beowulf’s Children (1995) (with Steven Barnes & Larry Niven) also known as The Dragons of Heorot (1995) (UK edition)
- Black Holes (anthology) (1981) (Editor, anthology)
- The Burning City (with Larry Niven)
- Burning Tower (sequel to The Burning City, with Larry Niven)
- The Children’s Hour (with S. M. Stirling)
- novelisation of the movie Escape from the Planet of the Apes (1973)
- Exiles to Glory (1977)
- Footfall (with Larry Niven)
- Go Tell The Spartans (with S. M. Stirling)
- The Gripping Hand (1993) (with Larry Niven) also known as The Moat Around Murcheson’s Eye (UK edition)
- High Justice (1972–1975)
- The Houses of the Kzinti (with S. M. Stirling and Dean Ing)
- Inferno (with Larry Niven)
- Janissaries
- Janissaries II: Clan and Crown (with Roland J. Green)
- Janissaries III: Storms of Victory (with Roland J. Green)
- Janissaries IV: Mamelukes (Unpublished; working title)
- The Legacy of Heorot (1987) (with Larry Niven & Steven Barnes)
- Lucifer’s Hammer (with Larry Niven)
- Men of War (1993)
- The Mercenary (1977)
- The Mote in God’s Eye (with Larry Niven)
- Oath of Fealty (with Larry Niven)
- Prince of Mercenaries
- Prince of Sparta (with S. M. Stirling)
- Red Heroin (as Wade Curtis) (1965)
- Red Dragon (as Wade Curtis) (1970)
- A Spaceship for the King (1973) expanded as King David’s Spaceship (1981)
- Starswarm (2003)
- There Will be War (with John F. Carr), Vols I-IX
- Tran (with Roland J. Green, single-volume combination of the second and third Janissaries novels)
- West of Honor (1976)
- Fallen Angels (with Larry Niven & Michael Flynn) (1991) (Prometheus Award) ISBN 0-7434-3582-6. Electronic edition free at the Baen Free Library
