1-十八烷醇，或硬脂醇是一种脂肪醇，化学式为CH₃(CH₂)₁₆CH₂OH。在室温下，1-十八烷醇为一白色细粒或薄片。它不溶于水，有低毒性。

可用于润滑剂、树脂、香水及化妆品的原材料，并多方面用于药膏中的润肤膏、乳化剂和增稠剂。

Stearyl alcohol (also known as octadecyl alcohol or 1-octadecanol) is an organic compound with the formula CH₃(CH₂)₁₆CH₂OH. It is classified as a fatty alcohol. It takes the form of white granules or flakes, which are insoluble in water. It has a wide range of uses as an ingredient in lubricants, resins, perfumes and cosmetics. It is used as an emollient, emulsifier, and thickener in ointments of various sorts, and is widely used as a hair coating in shampoos and hair conditioners. It has also found application as an evaporation suppressing monolayer when applied to the surface of water.