Novels

• The Eclipse of Dawn (1971)
• A Trace of Dreams (1972)
• Beyond the Resurrection (1973)
• Inheritors of the Earth (1974) (with Poul Anderson)
• All Times Possible (1974)
• Serving in Time also known as Laser Books No. 6: Serving in Time (Laser Books, 1975, ISBN 0-373-72006-8)
• Falling Toward Forever also known as Laser Books No. 10. Falling Toward Forever (Laser Books, 1975, ISBN 0-373-72010-6)
• Dance of the Apocalypse also known as Laser Books No. 46. Dance of the Apocalypse (Laser Books, 1976, ISBN 0-373-72046-7)
• The Grayspace Beast (1976)
• If the Stars Are Gods (1977) (with Gregory Benford)
• Twilight River (1979)
• The Garden of Winter (1980)
• Find the Changeling (1980) (with Gregory Benford)
• A Thunder on Neptune (1989)

Lord Tedric series

• Lord Tedric (Baronet hardcover, June 1978, ISBN 0-89437-021-9; Ace Books paperback, November 1978, ISBN 0-441-49255-X)
• Space Pirates also known as Lord Tedric No. 2: Space Pirates (Ace Books, March 1980, ISBN 0-441-77760-0)
• Black Knight of the Iron Sphere also known as Lord Tedric III: Black Knight of the Iron Sphere (Ace Books, June 1981, ISBN 0-441-49256-8)
• Alien Realms (Star Books, November 1980, ISBN 0-352-30770-6) as E. E. "Doc" Smith

Star Trek

• The Starless World also known as Star Trek Adventures 3: The Starless World (Bantam Books, November 1978, ISBN 0-553-24675-5)
• Devil World also known as Star Trek Adventures 8: Devil World (Bantam Books, November 1979, ISBN 0-553-24677-1)

Anthologies with Eklund stories

• Universe 1 (1971)
• Universe 2 (1972)
• The Best Science Fiction of the Year 2 (1973)
• Universe 3 (1973)
• Universe 4 (1974)
• The Best Science Fiction of the Year 4 (1975)
• Nebula Award Stories 10 (1975)
• Universe 6 (1976)
• Universe 8 (1978)
• The Best Science Fiction of the Year 8 (1979)
• Beyond Reality (1979)
• Binary Star, No. 2 (Dell Publishing, 1979, ISBN 0-440-11090-4)
• First Contact (1987)
• The Science Fiction Century (1996)

Short stories include

• "Dear Aunt Annie" (Fantastic, April 1970)
• "West Wind, Falling" (1971) (with Gregory Benford)
• "Gemini Cavendish" (Amazing Stories, March 1971)
• "To End All Wars" (Amazing Stories, November 1971)
• "Grasshopper Time" (1972)
• "Stalking the Sun" (1972)
• "Free City Blues" (1973)
• "The Ascending Aye" (Amazing Stories, January 1973)
• "The Beasts in the Jungle" (Fantasy and Science Fiction, November 1973)
• "Moby, Too" (Amazing Stories, December 1973)
• "If the Stars Are Gods" (1974) (with Gregory Benford)
• "Tattered Stars, Tarnished Bars" (1974)
• "What Did You Do Last Year?" (1976) (with Gregory Benford)
• "Vermeer's Window" (1978) (with Gregory Benford)
• "Objects Unidentified" (Flying)" (1997)
• "The Cross Road Blues" (Fantasy and Science Fiction, February 1999)
• "Sense of Wonder" (Astonishing Trapdoor Stories #22; fanzine published mid-2003)

• 1971 Nebula (nomination) - Novelette "Dear Aunt Annie"
• 1975 Nebula - Novelette winner (1975) "If the Stars Are Gods" (with Gregory Benford)