苏丹红是一种亲脂性偶氮化合物，作为人工合成的红色工业染料，被广泛用于如溶剂、油、蜡、汽油的增色以及鞋、地板等增光方面。

苏丹红主要包括Ⅰ、Ⅱ、Ⅲ和Ⅳ四种类型。

Sudan Red G is a yellowish red lysochrome azo dye. It has the appearance of an odorless reddish-orange powder with melting point 225 °C. It is soluble in fats and used for coloring of fats, oils, and waxes, including the waxes used in turpentine-based polishes. It is also used in polystyrene, cellulose, and synthetic lacquers. It is insoluble in water. It is stable to temperatures of about 100-110 °C. It was used as a food dye. It is used in some temporary tattoos, where it can cause contact dermatitis. It is also used in hair dyes. It is a component of some newer formulas for red smoke signals and smoke-screens, together with Disperse Red 11.