萘普生（英语：Naproxen、INN），是一种NSAID，用于缓解普通或严重的疼痛、发热、发炎，以及由风湿性关节炎、类风湿性关节炎、银屑病关节炎、痛风、强直性脊柱炎、经痛、肌腱炎、滑囊炎等病症引发的强直性反应，对月经失调也有治疗效果。该药通过抑制cox-1和cox-2两种环氧酶发挥药效。萘普生系列在中国市场上的商品名即为萘普生，在美国，以Aleve, Anaprox, Miranax, Naprogesic, Naprosyn, Naprelan, Proxen, Synflex等商品名销售。

Naproxen (brand names: Aleve, Naprosyn, and many others) is a nonsteroidal anti-inflammatory drug (NSAID) of the propionic acid class (the same class as ibuprofen) that relieves pain, fever, swelling, and stiffness. It is a nonselective COX inhibitor, usually sold as the sodium salt.