Key - US (set in the States), UK (set in the UK), YA (specifically geared to young adults), Old (written before 1990) - others should be obvious. I am not the mistress of the list, please feel free to alter as you see fit - Nooka please could you add and categorise yours accordingly?
Zombie
Deadline Trilogy – Mira Grant (US)
Alison Hewitt is Trapped etc – Madeleine Roux (US)
Death by Revelation trilogy – Jack J Lee (US)
Apocalypse Z series – Manel Loureiro (Spain)
White Flag of the Dead – Joseph Talluto (?)
Zombie Fallout series – Mark Tufo (?)
dEaDINBURGH – Mark Wilson & Paul McGuigan (UK)
The Undead – R R Haywood (?)
All the dead are here – Pete Bevan (?)
Zombie Takeover – K Bartholemew (?)
World War Z – Max Brooks (Worldwide)
Dead World series – Joe McKinney (?)
Autumn series – David Moody (?)
Drop Dead Gorgeous etc – Wayne Simmons (Ireland)
Day by Day Armageddon – J L Bourne (?)
Code Zero etc – Jonathan Maberry (?)
The Rising – Brian Keene (?)
Dead Bastards – Jenny Thompson (?)
Tube Riders trilogy – Chris Ward (?)
Other apocalypse/dystopia
Brave New World - Aldous Huxley (Old)
The Stand – Stephen King (also Mist, Cell etc) (Old, US)
Earth Abides – George R Stewart (Old, US)
Handmaid’s Tale – Margaret Atwood (Old, Canada/US)
MaddAdam Trilogy – Margaret Atwood (Canada/US)
1984 – George Orwell (Old, UK)
Silo49 – Ann Christy (?)
Day of the Triffids etc – John Wyndham (Old, UK)
The White Mountains etc – John Christopher (Old, ?)
Swan Song – Robert R McCammon (?)
Shades of Grey etc – Jasper Fforde (Humourous)
Divided Kingdom – Rupert Thomson (?)
Chaos Walking series– Patrick Ness (?)
Last Light – Alex Scarrow (UK)
Computer One – Warwick Collins (?)
Redaction series – Linda Andrews (?)
The Girl with all the Gifts – MR Carey (UK, YA)
The Last Policeman – Ben Winters (?)
Cloud Atlas – David Mitchell (Worldwide, multilayer structure)
Outpost – Adam Baker (?)
Far North – Marcel Theroux (Siberia)
One Second After – William R Forstchen (?)
Domain – James Herbert (?)
The Road – Cormac McCarthy (US)
Yesterday’s Gone – Sean Platt & David Wright (?)
Bird Box – Josh Malerman (?)
The Flood – Stephen Baxter (?)
Z for Zachariah – Robert C O’Brien (Old, ?)
Children of the Dust – Louise Lawrence (Old, UK)
Hunger Games – Suzanne Collins (YA, US)
Divergent – Virginia Roth (YA, US)
The Gift – Lois Lowry (YA, US)
Wool trilogy – Hugh Howey (YA)
Inside Out – Maria V Snyder (YA)
Devil on my back etc – Monica Hughes (YA)
The Delikon etc – HM Hoover (YA)
Blood Red Road – Moira Young (YA)
The Fear etc – Charlie Higson (YA)
Shade’s Children – Garth Nix (YA)
Sparrow Rock – Nate Kenyon (YA)
Life as we know it trilogy – Susan Beth Pfeffer (YA)
Fantasy:
Jonathan Strange and Mr Norrell - Susanna Clarke (?)
Dragonflight etc – Anne McCaffrey (?)
London Underground series – David Aaronovitch (YA, UK)
Battle etc – L M Pruitt (?)
The day Aberystwth stood still etc – Malcolm Pryce (Humourous, UK)
Vampire
Vampire for hire – J R Rain (?)
True Blood series - Charlaine Harris (US)
The Passage series – Justin Cronin (US)
Interview With The Vampire - Anne Rice (US)
Sci-fi:
2001: A Space Odyssey - Arthur C Clarke (Old)
The Foundation (series) - Isaac Asimov (Old)
Dune - Frank Herbert (Old)
Hyperion - Dan Simmons (?)
Neuromancer, Mona Lisa Overdrive, Idoru - William Gibson (?)
Snow Crash, The Diamond Age, Cryptonomicon, Anathem - Neal Stephenson (?)