Most of these are Canadian authors living in Canada. A few of them live outside of Canada, and a few authors listed here (the ones with * next to their name) are not Canadian citizens but either live or lived - and write/wrote - in Canada long enough for us to claim them. A few of the authors listed only write in French and haven't been translated into English. In other cases I used one of their English titles.
Most of this list was compiled several years ago when I was still working at the World's Biggest Bookstore (back then I did an endcap with Ontario Speculative Fiction Authors, and posted a reading list). I did a few google searches to flesh out authors I didn't know about or had forgotten. While it's a long list, it's not comprehensive. I try to know a lot but I can't know every everything, so if you know someone who's been missed or someone who was added and shouldn't have been, please tell me in the comments.
Below the Line - Scott Albert
The Stoneholding - James Anderson and Mark Sebanc
The Masked Truth - Kelley Armstrong
vN - Madeline Ashby
Handmaid’s Tale - Margaret Atwood
What We Salvage - David Baillie
The Night Inside - Nancy Baker
The White-Luck Warrior - R. Scott Bakker
The Binding Stone - Don Bassingthwaite
Deadwalk - Stephanie Bedwell-Grime
The Lake and the Library - Samantha Beiko
Destiny's Blood - Marie Bilodeau
Above - Leah Bobet
Nexus: Ascension - Robert Boyczuk
L'Oiseau de Feu - Jacques Brossard (French)
Small Magics - Erik Buchanan
Les crabes de Venus regardent vers le ciel - Alain Bergeron (French)
Pontypool Changes Everything - Tony Burgess
The Red Knight - Miles Cameron
Genesis - Paul Chafe
The Dragon’s Eye - Joel Champetier
The Good Brother - E. L. Chen
Appleseed - John Clute
The Summer is Ended and We Are Not Yet Saved - Joey Comeau
Neptune’s Children - Michael Coney *
A Turn of Light - Julie Czerneda
Angel of Death - Karen Dales
Sarah Court - Craig Davidson (aka Nick Cutter/Patrick Lestewka)
Against a Darkening Sky - Lauren Davis
Under My Skin - Charles de Lint
Indigo Springs - A. M. Dellamonica
The Bone Mother - David Demchuk
Maleficium - Martine Desjardins
The Dragon and the George - Gordon Dickson
Makers - Cory Doctorow *
Black Wine - Candas Jane Dorsey
Alchemist’s Apprentice - Dave Duncan
The Honey Month - Amal El-Mohtar
Gardens of the Moon - Steve Erikson
Shrinking the Heroes - Minister Faust
Book of Tongues - Gemma Files
Shadowplay - Nigel Findley *
Halcyon - Catherine Fitzsimmons
Triptych - J. M. Frey
Hunted - James Alan Gardner
Stuff of Legends - Ian Gibson
Spook Country - William Gibson
The Old Die Rich - H. L. Gold
Mindworld - Phillis Gotlieb
Hopeful Monsters - Hiromi Goto *
Sailing Time’s Ocean - Terence Green
Elminster Enraged - Ed Greenwood
Venus on Orbis - P. J. Haarsma
Lament for the Afterlife - Lisa Hannett
Filaria - Brent Hayward *
Gamification - Keith Hollihan
The New Moon's Arms - Nalo Hopkinson
The Wild Ways - Tanya Huff
Fools Errant - Matthew Hughes *
The Keeper of the Isis Light - Monica Hughes *
Spells of Blood and Kin - Claire Humphrey
Northern Frights - Don Hutchison
Blackdog - K. V. Johansen
Fall From Earth - Matthew Johnson
River of Stars - Guy Gavriel Kay
The Skids - Ian Donald Keeling
Ouroboros - Michael Kelly
The Snow Queen - Eileen Kernaghan
Revenge of the Vampire King - Nancy Kilpatrick
The Moon Goddess and the Son - Donald Kingsbury *
Alex and the Ironic Gentleman - Adrienne Kress
Objects of Worship - Claude Lalumiere
Once Every Never - Lesley Livingston
Gaslight Dogs - Karin Lowachee
Running on Instinct - Nicole Luiken (aka N.M. Luiken)
The Moon Under Her Feet - Derwin Mak
The Mirror Prince - Violette Malan (aka V. M. Escalada)
The Prince of the Golden Cage - Nathalie Mallet
Sporeville - Paul Marlowe
Hair Side, Flesh Side - Helen Marshall
Ninja Versus Pirate Featuring Zombies - James Marshall
Darwin’s Paradox - Nina Marteanu
The City Underground - Suzanne Martel
The Delphi Room - Melia McClure
Angels and Exiles - Yves Meynard
The Thirteen - Susie Moloney
Temps Mort - Charles Montpetit (French)
Resenting the Hero - Moira Moore
Certain Dark Things - Silvia Moreno-Garcia
Everyone in Silico - Joe Munroe
Napier’s Bones - Derryl Murphy
Blaze of Glory - Sheryl Nantus
Eutopia - David Nickle
Technicolor Ultra Mall - Ryan Oakley
Janus - John Park *
The Silver Lake - Fiona Patton
Nelle de Vilveq - Francine Pelletier (French)
At the Edge of Waking - Holly Phillips
Sins of the Angels - Linda Poitevin
The Raven's Warrior - Vincent Pratchett
The Demonologist - Andrew Pyper
Dark Matter - Garfield Reeves-Stevens
Telempath - Spider Robinson *
The Shell - Esther Rochon
Every House is Haunted - Ian Rogers
The Mona Lisa Sacrifice - Peter Roman
Enter, Night - Michael Rowe
Paradise Tales - Geoff Ryman
Silence - Michelle Sagara (aka Michelle Sagara West)
Red Planet Blues - Robert J. Sawyer
Virga: Cities of the Air - Karl Schroeder
Chronoreg - Daniel Sernine (French)
Sacrifice of the Widow - Lisa Smedman
Chimerascope - Douglas Smith
Moonfall - Heather Spears
Bloodlight Chronicles: Reconciliation - Steve Stanton
The Prince of Outcasts - S. M. Stirling *
Dead Girls Don’t - Mags Storey
Nobody's Son - Sean Stewart
The Angels of our Better Beers - Jerome Stueart
Ink - Amanda Sun
Frozen Blood - Joel A. Sutherland
The Pattern Scars - Caitlin Sweet
Take Us To Your Chief and Other Stories - Drew Hayden Taylor
Run With the Wolves: The Pack - T. C. Tombs
Defining Diana - Hayden Trenholm
Night Runner - Max Turner
Battle Dragon - Edo van Belkon
Slan - A. E. Van Vogt
In the Mother’s Land - Elisabeth Vonarburg *
Among Others - Jo Walton *
Meatheads - Noah Wareness
Blind Sight - Peter Watts
Station Gehenna - Andrew Weiner *
The World More Full of Weeping - Robert Wiersema
Lost in Translation - Edward Willett
The Courtesan Prince - Lynda Williams
Spin - Robert Charles Wilson
Westlake Soul - Rio Youers
Major Karnage - Gord Zajac