葡萄柚（学名：Citrus × paradisi），是芸香科柑橘属的一种亚热带植物。为常见的水果之一。

常绿乔木，通常高度为5-6米，最高可达13-15米。叶子狭长，为深绿色，花为四瓣白色。果实为扁球形，直径10-15cm，皮为黄橙色，常数十个簇生成穗，形似葡萄，故名。果肉分瓣且酸，品种不同其颜色也有区别，包括白色、粉红和红色。

The grapefruit (Citrus × paradisi) is a subtropical citrus tree known for its sour to semi-sweet fruit. Grapefruit is a hybrid originating in Barbados as an accidental cross between two introduced species, sweet orange (C. sinesis) and pomelo or shaddock (C. maxima), both of which were introduced from Asia in the seventeenth century. When found, it was named the "forbidden fruit"; and it has also been misidentified with the pomelo.