Honours and Awards
- Nebula Award finalist, Best Novella, 1974, "Junction."
- Locus Award finalist, Best Novella, 1974, "Junction."
- Locus Award finalist, Best Original Anthology, 1975, Wandering Stars.
- Nebula Award finalist, Best Novelette, 1976, "The Dybbuk Dolls."
- Honorary Member, The Mark Twain Society, 1975-present, [Esteemed Knight].
- Locus Award finalist, Best Anthology, 1977, Future Power.
- Locus Award finalist, Best Anthology, 1979, Immortal.
- Nebula Award finalist, Best Short Story, 1979, "A Quiet Revolution for Death."
- Locus Award finalist, Best Short Story, 1979, "A Quiet Revolution for Death."
- Nebula Award finalist, Best Novelette, 1980, "Camps."
- British Science Fiction Association Award finalist, Best Short Fiction, 1980, "Camps."
- Locus Award finalist, Best Novelette, 1980, "Camps."
- Nebula Award finalist, Best Novella, 1982, "Amnesia."
- Locus Award finalist, Best Novella, 1982, "Amnesia."
- World Fantasy Award finalist, Best Short Story, 1982, "Fairy Tale."
- Nebula Award finalist, Best Short Story, 1982, "Going Under."
- Locus Award finalist, Best Novelette, 1982, "Going Under."
- Locus Award finalist, Best Anthology, 1982, More Wandering Stars.
- Nebula Award finalist, Best Short Story, 1983, "High Steel."
- Locus Award finalist, Best Novelette, 1983, "High Steel."
- Nebula Award finalist, Best Novelette, 1984, "Blind Shemmy."
- Locus Award finalist, Best Novelette, 1984, "Blind Shemmy."
- Science Fiction Chronicle Readers' Award finalist, Best Novelette, 1984, "Blind Shemmy."
- Nebula Award finalist, Best Novelette, 1985, "Bad Medicine."
- World Fantasy Award finalist, Best Short Story, 1985, "Bad Medicine."
- Locus Award finalist, Best Short Story, 1985, "Bad Medicine."
- Nebula Award finalist, Best Novel, 1985, The Man Who Melted.
- Locus Award finalist, Best SF Novel, 1985, The Man Who Melted.
- Locus Award finalist, Best Anthology, 1986, Bestiary.
- Nebula Award finalist, Best Novelette, 1986, "The Gods of Mars."
- Locus Award finalist, Best Short Story, 1986, "The Gods of Mars."
- Premios Gilgamés de Narrativa Fantastica Award, Best Short Story, 1986, "Down Among the Dead Men." Spanish language award for work first published in Spanish in 1986. (The award is presented by the magazine Gilgamés.)
- World Fantasy Award finalist, Best Anthology, 1988, In the Field of Fire.
- Locus Award finalist, Best Anthology, 1988, In the Field of Fire.
- Locus Award finalist, Best Novelette, 1989, "Tea."
- Locus Award finalist, Best Short Story, 1990, "Kaddish."
- Locus Award finalist, Best Short Story, 1992, "Voices."
- Locus Award finalist, Best Novelette, 1993, "Jumping the Road."
- Nebula Award, Best Novella, 1997, "Da Vinci Rising."
- Asimov's Reader Poll, Best Novella, 1996, "Da Vinci Rising."
- Aurealis Award, Best Fantasy Novel, 1997, The Memory Cathedral. The Aurealis is a juried Australian award presented by the magazine Aurelais.)
- Ditmar Award finalist, Best Fantasy Novel, 1997, The Memory Cathedral. The Ditmar is a readers' award presented at the Australian National Science Fiction Convention.
- British Fantasy Society Award finalist, Best Novel, 1997, The Memory Cathedral.
- Aurealis Award, Best Science Fiction Short Story, 1998, "Niagara Falling."
- Ditmar Award, Best Science Fiction Short Story, 1998, "Niagara Falling."
- Benalla Award finalist for the Audio book of the Year, 1998, The Memory Cathedral. Part of the 1998 Braille & Talking Book Library Awards
- Aurealis Award finalist, convenors' category, 1999, Dreaming Down-Under.
- Ditmar Award, Best anthology, 1999, Dreaming Down_Under.
- World Fantasy Award, Best anthology, 1999, Dreaming Down Under. (This is the first time that an Australian book has ever won this award.)
- Locus Award finalist, Anthology, 1999, Nanotech.
- Locus Award finalist, Anthology, 1999, Nebula Awards 32.
- Aurealis Award Finalist, Best Horror Short Story, 2001, "Marilyn."
- Aurealis Award Finalist, Best Science Fiction Short Story, 2002, "The Diamond Pit."
- Aurealis Award Finalist, Best Fantasy Short Story, 2002, "The Diamond Pit."
- Ditmar Award, Best short fiction, 2002, "The Diamond Pit".
- Nebula Award finalist, Best novella, 2002, "The Diamond Pit.".
- Hugo Award Finalist, Best novella, 2002, "The Diamond Pit".
- Locus Award Finalist, Best novella, 2002, "The Diamond Pit".
- Ditmar Award Finalist, Best anthology, 2002, "Jubilee".
- Aurealis Award finalist, convenors' category, 2002, Jubilee.
- Peter MacNamara Achivement Award, 2004.
- International Horror Guild Award finalist, 2004, Gathering the Bones.
- Aurealis Award finalist, convenors' category, 2004, Gathering the Bones.
- Bram Stoker Award finalist, Best anthology, 2004, Gathering the Bones.
- World Fantasy Award finalist, Best anthology, 2004, Gathering the Bones.
- International Horror Guild Award finalist, Best anthology, 2004, Gathering the Bones.
- Locus Award finalist, Best anthology, 2004, Gathering the Bones.
- Aurealis Award finalist, Best Science Fiction Novel, 2005, The Rebel: An Imagined Life of James Dean.
- Darrell Award, Best Midsouth Novel, 2005, The Rebel: An Imagined Life of James Dean.
- John W. Campbell Memorial Award finalist, Best Science Fiction Novel, 2005, The Rebel: An Imagined Life of James Dean.
- Locus Award finalist, Best anthology, 2006, Nebula Awards Showcase 2005.
- Darrell Award finalist, Best Novella, 2008, "Rings Around the Moon".
- Shirley Jackson Award finalist, Best Anthology, 2008, Wizards.
- World Fantasy Award finalist, Best Anthology, 2008, Wizards.
- Peter McNamara Convernors Award for Excellence, 2009. (Aurealis award)