蒸汽庞克（Steampunk）是一种流行于20世纪80年代至90年代初的科幻题材，显着特征为故事都设定于一个某类低端科技极度发达的虚拟世界。这类故事对距今已较遥远的工业革命时代的科技进行了极大的夸张，创建出一个与当今科技文明或未来科技文明不同的、依赖于简单动力装置的机械科技世界。广义地说，将某种科技置于图腾地位，并将其力量无限化的时代或文化，都可算是蒸汽庞克。

蒸汽庞克多以维多利亚时代为背景，将蒸汽的力量无限扩大化，虚拟出一个蒸汽力量至上的时代。这种文化应该是起源于蒸汽革命之后，人们对于科技力量—“蒸汽”的神话，它的假设是工业革命发展到极致的人类文明时期。以蒸气动力为主的重型钢鉄机具做为人类社会发展所依赖的动力，并依此发明出各种交通飞行或科学上的成就。例如利用蒸气为动力的飞行船、蒸气火车以及特殊交通工具。“蒸汽庞克”一词出现于20世纪下半叶，但从今天的观点来看，工业革命时代所产生的许多科幻小说都可以归入该类别。当年人们的创作多是推崇科技的力量。而今天人们创作这类故事则多以对早期科技文化的怀旧与复古为目的。蒸汽庞克的怀旧风格与崇尚未来科技的时尚风格形成鲜明对比。

Steampunk is a subgenre of science fiction or science fantasy that incorporates technology and aesthetic designs inspired by 19th-century industrial steam-powered machinery. Although its literary origins are sometimes associated with the cyberpunk genre, steampunk works are often set in an alternative history of the 19th century's British Victorian era or American "Wild West", in a post-apocalyptic future during which steam power has maintained mainstream usage, or in a fantasy world that similarly employs steam power. Steampunk may, therefore, be described as neo-Victorian. Steampunk perhaps most recognisably features anachronistic technologies or retro-futuristic inventions as people in the 19th century might have envisioned them, and is likewise rooted in the era's perspective on fashion, culture, architectural style, and art. Such technology may include fictional machines like those found in the works of H. G. Wells and Jules Verne, or the modern authors Philip Pullman, Scott Westerfeld, Stephen Hunt and China Miéville. Other examples of steampunk contain alternative history-style presentations of such technology as lighter-than-air airships, analogue computers, or such digital mechanical computers as Charles Babbage's Analytical Engine.