葡萄糖酸（化学式：C₆H₁₂O₇），是葡萄糖的醛基经氧化生成的糖酸，D-葡萄糖酸学名“(2R,3S,4R,5R)-2,3,4,5,6-五羟基己酸”。

天然存在于水果、蜂蜜、红酒和红茶菌中。

Gluconic acid is an organic compound with molecular formula C₆H₁₂O₇ and condensed structural formula HOCH₂(CHOH)₄COOH. It is one of the 16 stereoisomers of 2,3,4,5,6-pentahydroxyhexanoic acid.

In aqueous solution at neutral pH, gluconic acid forms the gluconate ion. The salts of gluconic acid are known as "gluconates". Gluconic acid, gluconate salts, and gluconate esters occur widely in nature because such species arise from the oxidation of glucose. Some drugs are injected in the form of gluconates.