转口贸易（Entrepot Trade）又称中转贸易（intermediary trade）或再输出贸易（Re-Export Trade），是一个经济学的概念，是指国际贸易中进出口货物的买卖，不是在生产国与消费国之间直接进行，而是通过第三国转手进行的贸易。交易的货物可以由出口国运往第三国，在第三国不经过加工（改换包装、分类、挑选、整理等不作为加工论）再销往消费国；也可以不通过第三国而直接由生产国运往消费国，但生产国与消费国之间并不发生交易关系，而是由中转国分别同生产国和消费国发生交易。

Re-exportation may occur when one member of a free trade agreement charges lower tariffs to external nations to win trade, and then re-exports the same product to another partner in the trade agreement, but tariff-free. Re-exportation can be used to avoid sanctions by other nations. For example, the United Arab Emirates may have engaged in re-exportation of goods to Iran as a way for Iran to avoid U.S. trade sanctions against it. Thus re-exportation involves export without further processing or transformation of a good that has been imported. It is also called entrepot trade. In contrast, Finland imported crude oil from the Soviet Union as part of bilateral trade between these two countries and refined the oil for export to other Western European countries, while Soviet Union did not intend to sell oil to these capitalist countries, but this was not re-exportation because the crude oil was refined before selling.