Steampunk fashion is a subgenre of the steampunk movement in science fiction. It is a mixture of the Victorian era's romantic view of science in literature and elements from the Industrial Revolution in Europe during the 1800s. Steampunk fashion consists of clothing, hairstyling, jewellery, body modification and make-up. More modern ideals of steampunk can include t-shirts with a variety of designs or the humble jeans being accessorised with belts and gun holsters.

Steampunk fashion is a subgenre of the steampunk movement in science fiction. It is a mixture of the Victorian era's romantic view of science in literature and the industrialisation in most parts of Europe. The aesthetics of the fashion are designed with a post-apocalyptic era in mind. At the first steampunk convention, "SalonCon", in 2006, steampunk enthusiasts dressed up in costumes reflecting that era. The costumes included clothing, hairstyling, jewellery, body modification and make-up. Steampunk fashion has later gone on to include gadgets and contrasting accoutrements.

Initially, the clothes such as bustiers, bodices, jackets and other items were mostly handmade and customized, but as the steampunk movement grew, entrepreneurs and companies became interested and started to mass-produce steampunk clothing to be sold both online and in stores.

Since the genre emerged, the aesthetic of steampunk fashion has remained constant. New ideas in literature, and advancements in science and technology have resulted in subtle changes. Even though the genre did not become widely known until the late 20th century, steampunk and its fashion is said to have existed earlier.

During the 1980s and 1990s, steampunk fashion grew along with the goth and punk movements in fashion. Cyberpunk and dieselpunk fashion are variants of the steampunk fashion of the 1980s.

Works of writers from the end of the 19th century, such as those of Robert Louis Stevenson, G. K. Chesterton and Sir Arthur Conan Doyle are among the most influential for steampunk fashion. Those works attempted to domesticate Charles Dickens's London (from his industrial age novels). Sci-fi critics John Clute and Peter Nicholls have noted that steampunk is also inspired by a "strain of nostalgia". However, modern steampunk literature, which began only in the 1980s, has also influenced the steampunk fashion during the 2010s. Steampunk writers from that period are credited with creating fantasy tales set in cultures with style borrowed from the Victorian, with stories that includes giddy action scenes and elaborate baroque expeditions.

Kevin Jeter's 1979 novel Morlock Night is held to be the first steampunk novel, and the beginning of steampunk fashion.

Just like its counterparts in other art forms, primarily literature, steampunk fashion is based on the aesthetic of an alternate history. Even though critics disagree about it being rooted in fantasy literature, there are elements that suggests that some part of its aesthetic is conceived from books and films that showcase alternate history using fantasy. Interest in steampunk aesthetics may also be due to an increased interest from the fashion industry in Victorian spiritualism, during the 2010s.