| YEAR | TITLE | TYPE | SERIES | PUBLISHED IN |
| 1969 | The Warlock in Spite of Himself | Novel | Warlock of Gramarye | |
| 1971 | King Kobold | Novel | Warlock of Gramarye | |
| 1979 | A Wizard in Bedlam | Novel | Rogue Wizard | |
| 1982 | The Warlock Unlocked | Novel | Warlock of Gramarye | |
| 1983 | Escape Velocity | Novel | DDT-verse | |
| 1984 | King Kobold Revived | Novel | Warlock of Gramarye | |
| To My Readers | Essay | Warlock of Gramarye | King Kobold Revived | |
| 1985 | The Warlock Enraged | Novel | Warlock of Gramarye | |
| 1986 | To the Magic Born | Omnibus | Warlock of Gramarye | |
| The Warlock Enlarged | Omnibus | Warlock of Gramarye | ||
| The Warlock Wandering | Novel | Warlock of Gramarye | ||
| The Warlock Is Missing | Novel | Warlock of Gramarye | ||
| Her Majesty's Wizard | Novel | Wizard in Rhyme | ||
| About the Author | Essay | Wizard in Rhyme | Her Majesty's Wizard | |
| 1987 | The Warlock Heretical | Novel | Warlock of Gramarye | |
| 1988 | The Warlock's Night Out | Omnibus | Warlock of Gramarye | |
| Civilians | Short Story | The Fleet | vol. 2: Counter Attack | |
| The Warlock's Companion | Novel | Warlock of Gramarye | ||
| 1989 | Suicide Mission | Short Story | The Fleet | vol. 3: Break Through |
| The Warlock Insane | Novel | Warlock of Gramarye | ||
| Odd Warlock Out | Omnibus | Warlock of Gramarye | ||
| 1990 | Resistance | Short Story | The Fleet | vol. 4: Sworn Allies |
| How the Rebellion Came to a Shuddering Halt | Short Story | Drabble II: Double Century | ||
| Pirates | Short Story | The Fleet | vol. 5: Total War | |
| Warlock: To the Magic Born (UK Edition) | Omnibus | Warlock of Gramarye | ||
| The Simulated Golem | Short Story | Time Gate | vol. 2: Dangerous Interfaces | |
| The Warlock Rock | Novel | Warlock of Gramarye | ||
| 1991 | Orphans | Short Story | The Fleet | vo. 6: Crisis |
| Papa Don't 'Low | Short Story | The War Years | vol. 2: The Siege of Arista | |
| The Warlock Enlarged (UK Edition) | Omnibus | Warlock of Gramarye | ||
| The Warlock's Night Out (UK Edition) | Omnibus | Warlock of Gramarye | ||
| A Company of Stars | Novel | Starship Troupers | ||
| Warlock and Son | Novel | Warlock of Gramarye | ||
| The Crafters (Editor) (with Bill Fawcett) | Anthology | Crafters | ||
| The Alchemist and the Witch | Short Story | Crafters | vol. 1: The Crafters | |
| 1992 | Goblin's Children | Short Story | The Fleet | Battlestation vol. 1 | The Crafters vol. 2: Blessings & Curses (Editor) (with Bill Fawcett) | Anthology | Crafters |
| Who Ghost There? | Short Story | Crafters | vol. 2: Blessings & Curses | |
| The Enchanter Reborn (Editor) (with L. Sprague de Camp) | Anthology | Incomplete Enchanter | ||
| Introduction | Essay | Incomplete Enchanter | The Enchanter Reborn | |
| Professor Harold and the Trustees | Short Story | Incomplete Enchanter | The Enchanter Reborn | |
| Sir Harold and the Monkey King | Short Story | Incomplete Enchanter | The Enchanter Reborn | |
| What Are We Going to Do With Grandfather? | Short Story | The Magic of Christmas: Holiday Stories of Fantasy & Science Fiction | ||
| The Gods of War (Editor) | Anthology | |||
| Gordon's Quest | Short Story | The Gods of War | ||
| 1993 | We Open on Venus | Novel | Starship Troupers | |
| A Wizard in Absentia | Novel | Rogue Wizard | ||
| The Oathbound Wizard | Novel | Wizard in Rhyme | ||
| Hearing | Short Story | The Fleet | Battlestation vol. 2: Vanguard | |
| Mission of Mercy | Short Story | The Harriers | vol. 2: Blood and War | |
| The Ghost of Resartus | Short Story | Bolos | vol. 1: Honor of the Regiment | |
| 1994 | End Run (with William R. Forstchen) | Novel | Wing Commander | |
| The Witch Doctor | Novel | Wizard in Rhyme | ||
| Dragon's Eye (Editor) | Anthology | |||
| In the Heavens and On the Earth | Short Story | Dragon's Eye | ||
| A Slight Detour | Novel | Starship Troupers | ||
| M'Lady Witch | Novel | Warlock's Heirs | ||
| Shared Experience | Short Story | Bolos | vol. 2: The Unconquerable | |
| 1995 | The Secular Wizard | Novel | Wizard in Rhyme | |
| A Wizard in Mind | Novel | Rogue Wizard | ||
| Quicksilver's Knight | Novel | Warlock's Heirs | ||
| The Shaman | Novel | Star Stone | ||
| The Exotic Enchanter (Editor) (with L. Sprague de Camp) | Anthology | Incomplete Enchanter | ||
| Sir Harold and the Hindu King | Short Story | Incomplete Enchanter | The Exotic Enchanter | |
| The Day the Magic Stopped (Editor) (with Bill Fawcett) | Anthology | |||
| Pride and Puppetry | Short Story | The Day the Magic Stopped | ||
| A Wizard in War | Novel | Rogue Wizard | ||
| 1996 | Return with Your Spacesuit, Or On It (with Eleanore Stasheff) | Short Story | Don't Forget Your Spacesuit, Dear | |
| A Wizard in Peace | Novel | Rogue Wizard | ||
| The Sage | Novel | Star Stone | ||
| 1997 | My Son, the Wizard | Novel | Wizard in Rhyme | |
| A Wizard in Chaos | Novel | Rogue Wizard | ||
| 1998 | The Alchemist and the Witch | Short Story | Crafters | A Magic Lover's Treasury of the Fantastic |
| A Wizard in Midgard | Novel | Rogue Wizard | ||
| 1999 | The Spell-Bound Scholar | Novel | Warlock's Heirs | |
| 2000 | The Haunted Wizard | Novel | Wizard in Rhyme | |
| A Wizard and a Warlord | Novel | Rogue Wizard | ||
| The Crusading Wizard | Novel | Wizard in Rhyme | ||
| The Feline Wizard | Novel | Wizard in Rhyme | ||
| A Wizard in the Way | Novel | Rogue Wizard | ||
| 2001 | A Wizard in a Feud | Novel | Rogue Wizard | |
| Here Be Monsters | Novel | Warlock's Heirs | ||
| 2002 | Coronach of the Bell | Short Story | Fantasy: DAW 30th Anniversary | |
| 2003 | Stolen Prophecy | Novel | Mage Knight | |
| Mind Out of Time | Collection | DDT-verse | ||
| Introduction | Essay | DDT-verse | Mind Out of Time | |
| The Warlock's Grandfather | Short Story | Warlock of Gramarye | Mind Out of Time | |
| The Martyrdom of St. Vidicon of Cathode | Short Story | DDT-verse | Mind Out of Time | |
| Mind Out of Time | Short Story | DDT-verse | Mind Out of Time | |
| 2004 | The Warlock's Last Ride | Novel | Warlock of Gramarye | |
| The Afterlife of St. Vidicon of Cathode | Short Story | DDT-verse | Masters of Fantasy | |
| 2005 | Saint Vidicon to the Rescue | Novel | DDT-verse | |
| 2007 | Introduction | Essay | Incomplete Enchanter | The Mathematics of Magic: The Enchanter Stories of de Camp and Pratt |