油轮（Oil tanker、Petroleum tanker）或称作油船，是主要用来运输原油、原油的提炼成品（如动力油、燃料油）等石油化工液体产品的液货船，也可以用来运输其它液体（如水、葡萄酒）等。运油船主要分为运送原油的油船与运送石化成品的油船两类。

油轮很容易与其它轮船区别开来。油轮的甲板非常平，除驾驶舱外几乎没有其它耸立在甲板上的东西。油轮不需要甲板上的吊车来装卸它的货物，只有在油轮的中部有一个小吊车，这个吊车的用途在于将码头上的管道吊到油轮上来与油轮上的管道系统接到一起。油轮上的管道系统从远处就可以看到。

An oil tanker, also known as a petroleum tanker, is a merchant ship designed for the bulk transport of oil. There are two basic types of oil tankers: the crude tanker and the product tanker. Crude tankers move large quantities of unrefined crude oil from its point of extraction to refineries. Product tankers, generally much smaller, are designed to move refined products from refineries to points near consuming markets.