产业（香港统计处或称为行业）指一个经济体中，有效运用资金与劳力 从事生产经济物品（不论是物品还是服务）的各种行业。经济学上，惯常把产业分门别类。一般而言，产业可分为三至五类。

在工业革命后，世界约三分之一的经济都是由制造业而来。许多已开发国家及开发中国家的发展及经济基础都和制造业有关。产业、所在的国家以及该国的经济之间有复杂相互影响的关系。

石油、金融和观光，为全球前三大规模的产业。信息业成长也相当快，物流业也是历久不衰。许多产值大的产业来自二、三产业。

Industry is the production of goods or related services within an economy. The major source of revenue of a group or company is the indicator of its relevant industry. When a large group has multiple sources of revenue generation, it is considered to be working in different industries. Manufacturing industry became a key sector of production and labour in European and North American countries during the Industrial Revolution, upsetting previous mercantile and feudal economies. This occurred through many successive rapid advances in technology, such as the production of steel and coal.