奎尼酸(英语：Quinic acid，又叫金鸡纳酸）是一种环己多醇羧酸，能从金鸡纳树树皮、咖啡豆以及其它植物产物中提取，能通过绿原酸水解合成。奎尼酸也能影响咖啡的酸度。

Quinic acid is a cyclitol, a cyclic polyol, and a cyclohexanecarboxylic acid. It is a crystalline acid obtained from cinchona bark, coffee beans, and other plant products and made synthetically by hydrolysis of chlorogenic acid. Quinic acid is also implicated in the perceived acidity of coffee. It is a constituent of the tara tannins.