烟囱，指将烟雾、热气流从火炉、工业炉等排入大气的结构。烟囱多为垂直或近垂直结构。

公元前5000年左右，西安半坡古居民，在烧制陶器的时候即已使用类似烟囱的装置。约公元前3000年，古印度在冶炼铜的时候使用高烟囱排烟。 在西方，古罗马时代即有类似烟囱的管道，但真正的烟囱出现于12世纪。

A chimney is a structure which provides ventilation for hot flue gases or smoke from a boiler, stove, furnace or fireplace to the outside atmosphere. Chimneys are typically vertical, or as near as possible to vertical, to ensure that the gases flow smoothly, drawing air into the combustion in what is known as the stack, or chimney, effect. The space inside a chimney is called a flue. Chimneys may be found in buildings, steam locomotives and ships. In the United States, the term smokestack (colloquially, stack) is also used when referring to locomotive chimneys or ship chimneys, and the term funnel can also be used.