Steampunk is a subgenre of science fiction that typically features steam-powered machinery, especially in a setting inspired by industrialized Western civilization during the 19th century. (Wikipedia)
The Time Machine (1895) by H. G. Wells
A Victorian scientist uses his remarkable invention to hurtle himself some eight hundred thousand years into the future and encounters a world populated by two distinct races, the childlike Eloi and the disgusting Morlocks who prey on them. The novel was a major influence on steampunk as a subgenre.
The Somnambulist (2008) by Jonathan Barnes
A tale set in Victorian London introduces the characters of a stage magician and detective and his silent sidekick, whose fiendish plot to re-create the apocalyptic prophecies of Samuel Taylor Coleridge threaten the British Empire.
The Manual of Detection (2009) by Jedediah Berry
Unexpectedly promoted to detective when his predecessor goes missing and a supervisor is killed, agency clerk Charles Unwin struggles with inexperience, nerves, and a perpetually sleepy assistant during a case in which he encounters bizarre clues and is framed for murder.
Soulless (2009) by Gail Carriger
When Alexia, a soulless spinster with the ability to negate supernatural powers, accidentally kills a vampire, her life goes from bad to worse when Lord Maccon, a gorgeous werewolf, is sent by Queen Victoria to investigate.
The Glass Books of the Dream Eaters (2006) by Gordon DahlquistDetermined to find out why her engagement to Roger Bascombe was abruptly terminated, Celeste Temple disguises herself to follow her erstwhile fiancé to forbidding Harschmont Manor, which becomes a terrifying gate into a seductive and shocking world linked to a terrifying conspiracy.
Ghosts by Gaslight: stories of steampunk and supernatural suspense (2011) edited by Nick Gevers and Jack Dann
Featuring stories by James Morrow, Terry Dowling, Garth Nix, and Robert Silverberg, this collection of steampunk and supernatural tales breathes new life into the Victorian and Edwardian ghost story for a new generation of readers.
Mainspring (2008) by Jake Lay
In a first installment of a series in which the planets are run by a sophisticated clockwork solar system that connects everyday people to the Creator, a young clockmaker’s apprentice is appointed by the Archangel Gabriel to rewind the Earth’s Mainspring to prevent a disaster.
Perdido Street Station (2000; 2003) by China Miéville
In the squalid, gothic city of New Crobuzon, a mysterious half-human, half-bird stranger comes to Isaac, a gifted but eccentric scientist, with a request to help him fly, but Isaac’s obsessive experiments and attempts to grant the request unleash a terrifying dark force on the entire city.
Boneshaker (2009) by Cherie Priest
Commissioned to build a machine that will promote gold-rush land-breaking efforts between Civil War-era Seattle and Alaska, inventor Leviticus Blue inadvertently triggers the release of a deadly gas that transforms people into the living dead, a situation that prompts his teenage son to restore the family reputation years later.
Mortal Engines (2001) by Philip Reeve
In the distant future, when cities move about and consume smaller towns, a fifteen-year-old apprentice is pushed out of London by the man he most admires and must seek answers in the perilous Out-Country, aided by one girl and the memory of another.
The Diamond Age (1995) by Neal Stephenson
A major writer in the “cyberpunk” genre, the author of Snow Crash imagines a future ruled by a rebirth of Victorian thinking, inhabited by a brilliant technologist who dares to rebel against it.
Leviathan (2009) by Scott Westerfield
In an alternate 1914 Europe, fifteen-year-old Austrian Prince Alek, on the run from the Clanker Powers who are attempting to take over the globe using mechanical machinery, forms an uneasy alliance with Deryn who, disguised as a boy to join the British Air Service, is learning to fly genetically-engineered beasts.
From The Ranting Dragon site.