Corn oil is a popular vegetable oil in the United States and in many other countries. Because of its pleasant nutty flavor, its good stability, and its popularity for making margarines, corn oil has long been considered a premium vegetable oil. Among all of the vegetable oils, corn oil ranks tenth in terms of annual production, and it represents about 2% of the vegetable oil produced worldwide. The chemical composition of corn oil is distinguished by its high levels of polyunsaturated fatty acids (an average value of 60–75% linoleic acid), and among the commodity vegetable oils corn oil has the highest levels of unsaponifiables (>2%), the highest levels of phytosterols (>1%), and the highest levels of Γ‐tocopherol (about 0.10%). Distillers corn oil (DCO) is a coproduct of corn ethanol production and has become a popular and affordable biodiesel feedstock in the United States. DCO shares many properties with conventional corn oil, but it has higher levels of lutein and zeaxanthin, which make it a valuable poultry feed ingredient. It is also more stable than conventional corn oil and has much higher levels of free fatty acids than most other vegetable oils.