复古游戏，或称经典游戏、怀旧游戏，是发行于老个人电脑、游戏机与街机的游戏。这些系统多过时或停产，因此在现代硬件上游玩需要使用模拟器，或直接游玩移植/合辑再版。热衷游玩或收集复古游戏的玩家有时被称为“怀旧玩家”。复古游戏和现代的独立游戏有所联系。此外该术语也指采用怀旧游戏元素的新游戏。

Retrogaming, also known as classic gaming and old school gaming, is the playing or collecting of older personal computer, console, and arcade video games in contemporary times. Usually retrogaming is based upon systems that are obsolete or discontinued. Retrogaming has three main types; vintage retrogaming, retrogaming emulation, and ported retrogaming. Vintage retrogaming includes games that are played on the original hardware. Emulation involves newer systems simulating old gaming systems, while ported retrogaming allows games to be played on modern hardware via ports or compilations. Participants in the hobby are sometimes known as retrogamers in the United Kingdom, while the terms "classic gamers" or "old school gamers" are more prevalent in the United States. Similarly, the games are known as retrogames, classic games, or old school games. Retrogaming is often linked to indie gaming, which involves current games, though unconventionally published. Additionally, the term could apply to a newer game, but with features similar to those of older games, such as an "retro RPG" which features turn-based combat and an isometric camera perspective. Retrogaming has existed since the early years of the video game industry, but was popularized with the popularity of the internet and emulation technology. It is argued that the main reasons players are drawn to retrogames are nostalgia for different eras, the idea that older games can be more challenging, and the simplicity of the games that requires less hours of gameplay.