壬基酚，也称壬基苯酚；英文名称为Nonyl Phenol（简称NP）；分子式为C₁₅H₂₄O。

壬基酚是一种重要的精细化工原料和中间体，外观在常温下为无色或淡黄色液体，略带苯酚气味，不溶于水，溶于丙酮。

Nonylphenols are a family of closely related organic compounds called alkylphenols. They are used in manufacturing antioxidants, lubricating oil additives, laundry and dish detergents, emulsifiers, and solubilizers. These compounds are also precursors to the commercially important non-ionic surfactants alkylphenol ethoxylates and nonylphenol ethoxylates, which are used in detergents, paints, pesticides, personal care products, and plastics. Nonylphenol has attracted attention due to its prevalence in the environment and its potential role as an endocrine disruptor and xenoestrogen, due to its ability to act with estrogen-like activity. Nonylphenol has been found to act as an agonist of the GPER (GPR30).