| Title | Date | Type | Notes | Series | Witch World Series |
| Prince Commands, The | 1934 | Adv | |||
| Ralestone Luck | 1938 | Adv | |||
| Follow the Drum | 1942 | Hist | |||
| Sword is Drawn, The | 1944 | Spy | Van Norreys-1 | ||
| Rogue Reynard | 1947 | Hist | |||
| Scarface | 1948 | Hist | |||
| Sword in Sheath | 1949 | Spy | also UK Island of the Lost | Van Norreys-2 | |
| Huon of the Horn | 1951 | Hist | |||
| Star Man's Son, 2250 A.D. | 1952 | S/F | also Daybreak -- 2250 A.D. | ||
| Star Rangers | 1953 | S/F | also Last Planet | Central Control-1 | |
| Murders For Sale | 1954 | Myst | also Sneeze On Sunday, w/ Grace Hogarth | ||
| At Swords' Points | 1954 | Spy | Van Norreys-3 | ||
| Stars are Ours!, The | 1954 | S/F | Astra/Pax-1 | ||
| Yankee Privateer | 1955 | Hist | Lyon-1 | ||
| Sargasso of Space | 1955 | S/F | Solar Queen-1 | ||
| Star Guard | 1955 | S/F | Central Control-2 | ||
| Plague Ship | 1956 | S/F | Solar Queen-2 | ||
| Crossroads of Time | 1956 | S/F | Blake Walker-1 | ||
| Stand to Horse | 1956 | Hist | |||
| Star Born | 1957 | S/F | Astra/Pax-2 | ||
| Sea Siege | 1957 | S/F | |||
| Star Gate | 1958 | S/F | |||
| Time Traders, The | 1958 | S/F | Ross Murdock-1 | ||
| Voodoo Planet | 1959 | S/F | Solar Queen-3 | ||
| Beast Master, The | 1959 | S/F | Ace pb is abridged | Hosteen Storm-1 | |
| Secret of the Lost Race | 1959 | S/F | also UK Wolfshead | ||
| Galactic Derelict | 1959 | S/F | Ross Murdock-2 | ||
| Storm Over Warlock | 1960 | S/F | Warlock-1 | ||
| Sioux Spaceman, The | 1960 | S/F | |||
| Shadow Hawk | 1960 | Hist | |||
| Ride Proud, Rebel! | 1961 | Hist | Drew Rennie-1 | ||
| Star Hunter | 1961 | S/F | |||
| Catseye | 1961 | S/F | |||
| Defiant Agents, The | 1962 | S/F | Ross Murdock-3 | ||
| Eye of the Monster | 1962 | S/F | |||
| Lord of Thunder | 1962 | S/F | Hosteen Storm-2 | ||
| Rebel Spurs | 1962 | Hist | Drew Rennie-2 | ||
| Key Out of Time | 1963 | S/F | Ross Murdock-4 | ||
| Witch World | 1963 | WW | Witch World-01 | Estcarp/Escore-1 Tregarth-1 | |
| Judgment on Janus | 1963 | S/F | Janus-1 | ||
| Web of the Witch World | 1964 | WW | Witch World-02 | Estcarp/Escore-2 Tregarth-2 | |
| Ordeal in Otherwhere | 1964 | S/F | Warlock-2 | ||
| Night of Masks | 1964 | S/F | |||
| Three Against the Witch World | 1965 | WW | Witch World-03 | Estcarp/Escore-3 Tregarth-3 | |
| Quest Crosstime | 1965 | S/F | also UK Crosstime Agent | Blake Walker-2 | |
| X Factor, The | 1965 | S/F | |||
| Steel Magic | 1965 | J-Fan | also Gray Magic | Magic-1 | |
| Year of the Unicorn | 1965 | WW | Witch World-04 | HighHallack-2 WereRiders-1 | |
| Moon of Three Rings | 1966 | S/F | Moon Singer-1 | ||
| Victory on Janus | 1966 | S/F | Janus-2 | ||
| Operation Time Search | 1967 | S/F | |||
| Octagon Magic | 1967 | J-Fan | Magic-2 | ||
| Warlock of the Witch World | 1967 | WW | Witch World-05 | Estcarp/Escore-4 Tregarth-4 | |
| Zero Stone, The | 1968 | S/F | Murdoc Jern-1 | ||
| Dark Piper | 1968 | S/F | |||
| Sorceress of the Witch World | 1968 | WW | Witch World-06 | Estcarp/Escore-5 Tregarth-5 | |
| Fur Magic | 1968 | J-Fan | Magic-3 | ||
| Bertie and May | 1968 | non-Fict | w/ Bertha Stemm Norton | ||
| Uncharted Stars | 1969 | S/F | Murdoc Jern-2 | ||
| Postmarked the Stars | 1969 | S/F | Solar Queen-4 | ||
| High Sorcery | 1970 | Fan | short stories | ||
| Ice Crown | 1970 | S/F | |||
| Dread Companion | 1970 | S/F | |||
| Exiles of the Stars | 1971 | S/F | Moon Singer-2 | ||
| Android at Arms | 1971 | S/F | |||
| Garan the Eternal | 1972 | Fan | short stories | ||
| Breed To Come | 1972 | S/F | |||
| Dragon Magic | 1972 | J-Fan | Magic-4 | ||
| Spell of the Witch World | 1972 | WW | short stories | Witch World-08 | HighHallack-3 |
| Crystal Gryphon, The | 1972 | WW | Witch World-07 | HighHallack-4 Gyphon-1 | |
| Forerunner Foray | 1973 | S/F | Warlock-3 | ||
| Here Abide Monsters | 1973 | Fan | |||
| Lavender Green Magic | 1974 | J-Fan | Magic-5 | ||
| Iron Cage | 1974 | S/F | |||
| Jargoon Pard, The | 1974 | WW | Witch World-09 | HighHallack-7 WereRiders-2 | |
| Outside | 1974 | J-Fan | expansion of "London Bridge" | ||
| Day of the Ness | 1975 | J-S/F | w/ Michael Gilbert | ||
| White Jade Fox, The | 1975 | Gothic | |||
| Merlin's Mirror | 1975 | S/F | |||
| No Night Without Stars | 1975 | S/F | |||
| Knave of Dreams | 1975 | S/F | |||
| Many Worlds of AN, The | 1975 | Fan | short stories+bib, also Book of AN | ||
| Star Ka'at | 1976 | J-S/F | w/ Dorothy Madlee | Star Ka'at-1 | |
| Perilous Dreams | 1976 | Fan | short stories | ||
| Wraiths of Time | 1976 | Fan | |||
| Red Hart Magic | 1976 | J-Fan | Magic-6 | ||
| Velvet Shadows | 1977 | HistRom | |||
| Trey of Swords | 1977 | WW | short stories | Witch World-10 | Estcarp/Escore-6 Yonan-1 |
| Opal-Eyed Fan, The | 1977 | HistRom | |||
| Quag Keep | 1978 | Fan | |||
| Star Ka'at World | 1978 | J-S/F | w/ Dorothy Madlee | Star Ka'at-2 | |
| Yurth Burden | 1978 | S/F | |||
| Zarsthor's Bane | 1978 | WW | Witch World-11 | HighHallack-8 | |
| Seven Spells to Sunday | 1979 | Fan | w/ Phyllis Miller | ||
| Snow Shadow | 1979 | Rom | |||
| Star Ks and the Plant People | 1979 | J-S/F | w/ Dorothy Madlee | Star Ka'at-3 | |
| Iron Butterflies | 1980 | Rom | |||
| Lore of the Witch World | 1980 | WW | short stories | Witch World-12 | |
| Voorloper | 1980 | S/F | |||
| Maid-at-Arms | 1981 | Gothic | by Enid Cushing, editorial work by AN | ||
| Gryphon in Glory | 1981 | WW | Witch World-13 | HighHallack-5 Gyphon-2 | |
| Forerunner | 1981 | S/F | Forerunner-1 | ||
| Horn Crown | 1981 | WW | Witch World-14 | HighHallack-1 | |
| Ten Mile Treasure | 1981 | Myst | |||
| Star Ks and the Winged Warriors | 1981 | J-S/F | w/ Dorothy Madlee | Star Ka'at-4 | |
| Moon Called | 1982 | Fan | |||
| Caroline | 1983 | Gothic | w/ Enid Cushing | ||
| Wheel of Stars | 1983 | Fan | |||
| Ware Hawk | 1983 | WW | Witch World-15 | Estcarp/Escore-7 | |
| Were-Wrath | 1984 | special | private/small press | ||
| Stand & Deliver | 1984 | HistRom | Lyon-2 | ||
| House of Shadows | 1984 | Fan | w/ Phyllis Miller | ||
| Gryphon's Eyrie | 1984 | WW | w/ A.C. Crispin | Witch World-16 | HighHallack-6 Gyphon-3 |
| Forerunner: The Second Venture | 1985 | S/F | Forerunner-2 | ||
| Ride the Green Dragon | 1985 | J-Myst | w/ Phyllis Miller | ||
| Flight in Yiktor | 1986 | S/F | Moon Singer-3 | ||
| Serpent's Tooth | 1987 | special | private/small press | ||
| Gate of the Cat, The | 1987 | WW | Witch World-17 | Estcarp/Escore-8 Yonan-2 | |
| Moon Mirror | 1988 | Fan | short stories | ||
| Imperial Lady | 1989 | Fan | w/ Susan Schwarz | ||
| Wizards' Worlds | 1989 | S/F | short stories | ||
| Dare to Go A-Hunting | 1990 | S/F | Moon Singer-4 | ||
| Black Trillium | 1990 | S/F | w/ M.Z. Bradley, Julian May | Trillium-1 | |
| Jekyll Legacy, The | 1990 | Horror | w/ Robert Bloch | ||
| Storms of Victory | 1991 | WW | w/ P.M. Griffin | Witch World-18 | Turning-1 |
| Elvenbane, The | 1991 | Fan | w/ Mercedes Lackey | Halfblood-1 | |
| Mark of the Cat, The | 1992 | Fan | |||
| Songsmith, The | 1992 | WW | w/ A.C. Crispin | Witch World-19 | HighHallack-9 |
| Flight of Vengeance | 1992 | WW | w/ P.M. Griffin, Mary H. Schaub | Witch World-20 | Turning-2 |
| Redline the Stars | 1993 | S/F | w/ P.M. Griffin | Solar Queen-5 | |
| Golden Trillium | 1993 | S/F | Trillium-2 | ||
| Brother to Shadows | 1993 | S/F | |||
| Empire of the Eagle | 1993 | HistFan | w/ Susan Schwarz | ||
| Firehand | 1994 | S/F | w/ P.M. Griffin | Ross Murdock-5 | |
| On Wings of Magic | 1994 | WW | w/ Patricia Mathews, Sasha Miller | Witch World-21 | Turning-3 |
| Hands of Lyr, The | 1994 | S/F | |||
| Elvenblood | 1995 | S/F | w/ Mercedes Lackey | Halfblood-2 | |
| Mirror of Destiny | 1995 | S/F | |||
| Key of the Keplian | 1995 | WW | w/ Lyn McConchie | Witch World-22 | Secrets-1 |
| Tiger Burning Bright | 1995 | S/F | w/ M.Z. Bradley, Mercedes Lackey | ||
| Monster's Legacy, The | 1996 | J-Fan | |||
| Magestone, The | 1996 | WW | w/ Mary H. Schaub | Witch World-23 | Secrets-2 |
| Warding of Witch World, The | 1996 | WW | Witch World-24 | Secrets-3 | |
| Derelict for Trade | 1997 | S/F | w/ Sherwood Smith | Solar Queen-6 | |
| Mind for Trade | 1997 | S/F | w/ Sherwood Smith | Solar Queen-7 | |
| Ciara's Song | 1998 | WW | w/ Lyn McConchie | Witch World-25 | |
| Scent of Magic, The | 1998 | S/F | |||
| Shadow of Albion | 1999 | HistFan | w/ Rosemary Edgehill | ||
| Echoes In Time | 1999 | S/F | w/ Sherwood Smith | Ross Murdock-6 | |
| Wind In the Stone | 1999 | Fan | |||
| To the King a Daughter | 2000 | Fan | w/ Sasha Miller |