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)
timemachine

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.



somnanbulist

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.



manualofdetection

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

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.



glassbooks

The Glass Books of the Dream Eaters (2006) by Gordon Dahlquist

Determined 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.

ghostsbygaslight

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.



mainsrping

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.



perdidostreet

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

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.



mortalengines

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.



diamondage

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

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.




ranting

Want more? Twenty Must Read Steampunk Books – An Introduction to the Genre

From The Ranting Dragon site.