Deutsch: Öle / Español: Aceite / Português: Óleo / Français: Huile

An oil is any neutral, nonpolar chemical substance, that is a viscous liquid at ambient temperatures, and is immiscible with water but soluble in alcohols or ethers. Oils have a high carbon and hydrogen content and are usually flammable and slippery. Oils may be animal, vegetable, or petrochemical in origin, and may be volatile or non-volatile.

In an industrial or manufacturing context, "oil" typically refers to a liquid hydrocarbon that is used as a source of energy, as a lubricant, and as a raw material in the production of a wide range of products. Oil is a fossil fuel that is extracted from the ground, primarily through drilling.