植物油，由植物来源取得的油脂，通常是由植物种子中取得，主要成分三酸甘油脂依来源不同有多种脂肪酸组合。植物油一词有时会特别用来指在室温下会保持液体形态的植物来源油脂(Plant oil)，而在室温下会保持固体形态的则称为植物脂(Plant fat)。人类从很古老的时代就开始使用植物油，主要用于烹调食物之用。热带植物油普遍相较于温寒带植物油，通常含有较多比例的饱和脂肪酸，因为其于高温下较为稳定，细胞膜脂结构较不易破坏。

A vegetable oil is a triglyceride extracted from a plant. Such oils have been part of human culture for millennia. The term "vegetable oil" can be narrowly defined as referring only to plant oils that are liquid at room temperature, or broadly defined without regard to a substance's state of matter at a given temperature. For this reason, vegetable oils that are solid at room temperature are sometimes called vegetable fats. Vegetable oils are composed of triglycerides, as contrasted with waxes which lack glycerin in their structure. Although many plant parts may yield oil, in commercial practice, oil is extracted primarily from seeds.